HK1019092B

HK1019092B - Improved single vision lenses

Info

Publication number: HK1019092B
Application number: HK99104189.5A
Authority: HK
Inventors: 科林‧莫里斯‧佩罗特; 凯文‧道格拉斯‧奥康纳; 西蒙‧约翰‧爱德华兹; 埃里克‧F‧巴坎; 戴维‧H‧斯克拉
Original assignee: Carl Zeiss Vision Australia Holdings Ltd
Priority date: 1996-03-21
Filing date: 1997-03-21
Publication date: 2009-04-03

Description

Improved simple-to-look lens

The present invention relates to lenses for sunglasses, and in particular to sunglass lenses having refractive power.

In the prior art, methods are known for manufacturing uncorrected spectacles, such as sunglasses or safety spectacles, having a winding member for protecting the eyes of a wearer from light, wind, sand and foreign bodies in the temporal field of vision.

Light in the visible and ultraviolet regions may enter the eye at angles up to 100 from the line of sight.

However, in the prior art sunglasses or safety glasses, glasses having refractive power have not been provided. Providing the radius of curvature required for the lens to define the prescription zone (prescription zone) makes the lens a bug eye shape, which is cosmetically undesirable.

Thus, prior art attempts to provide a wrap-around sun visor on the normal standard prescription eyeglasses have generally been cosmetically unacceptable and have significant optical distortion.

Accordingly, it is an object of the present invention to overcome, or at least mitigate, one or more of the corresponding difficulties and disadvantages of the prior art.

Thus, according to a first aspect, there is provided an optical lens element comprising

Front and back surfaces capable of forming a prescription (Rx) region; and

a peripheral temporal region.

Applicants have found that it is possible to provide sufficient lens area for the prescription region and still provide a lens with a shield in the temple region. This is achieved by having it have a peripheral temple area.

As used herein, the term "optical lens element" shall mean an optical or ophthalmic lens, a semi-finished lens or a lens made from a pair of lens wafers (wafers) that may be used to make an optical lens product.

The ophthalmic lens element may be a lens of positive or negative refractive power. Where the ophthalmic lens element comprises an ophthalmic lens wafer, the peripheral temporal region thereof may be provided by the front wafer.

The optical lens element of the present invention can be used for a frame of a wrap-around type or a shield type.

The peripheral temporal region may be at least partially generally toric. The peripheral temporal region may be at least partially generally flat.

The peripheral temporal region itself may constitute an extension of the prescription region, or may be an over-the-counter region.

According to an alternative or additional aspect, the peripheral temporal region may be modified to allow control of light within the region.

The lens element may be rotated temporarily (temporally) about a vertical axis passing through its optical center, or the optical axis may be off-center with respect to the geometric axis, or the lens element may be both rotated and off-center.

It will be seen that for a typical wrap-around sunglass element, its peripheral temporal region may extend, for example, approximately 10 to 25 mm.

According to another aspect of the invention, there is provided an optical lens element having a prescription (Rx) correction generally in the range of-6.0 diopter (D) to +6.0 diopter (D) with 0 to +3 cylinder (cyl)

Wherein its front surface can be mounted in a constant design curve (curve) frame independent of Rx, above 5.0D; and is

Providing a good gap between its posterior surface and the temples or eyelashes.

The ophthalmic lens element may form part of a series of lens elements, for example of the type described in international patent application PCT/EP97/00105, the entire disclosure of which is incorporated herein by reference.

The front face is preferably capable of being mounted in a frame with a constant design curve between 8.0D and 9.0D.

The anterior surface of the lens element more preferably has a high curve (Highcurve) extending from the nasal to temporal boundary, but a vertical curve at or below 6.0D.

It will be seen that this vertical curve enables the finished prescription lens, particularly an edged lens, to be adjusted to the shape of the wearer's face and closely packed in a rolled shape (a so-called "toric" design).

Additionally, the optical lens element may be adapted to be mounted in a shutter frame. Thus, according to yet another aspect of the present invention, there is provided an integral optical lens comprising

A pair of optical lens elements, each lens element providing prescription (Rx) correction generally in the range of-6.0D to +6.0D with 0 to +3cyl

Wherein its front surface can be mounted in a frame of constant design curve independent of Rx, above 5.0D; and is

Accordingly, in a particularly preferred embodiment of the invention, there is provided an eyeglass frame, or unitary lens, comprising a pair of optical lens elements, each lens element providing correct Rx correction for a wearer in a prescription (Rx) zone up to 50 ° off-axis, preferably 80 ° off-axis, and terminating in a peripheral temporal zone, thereby providing a clear view of objects in a peripheral zone of the field of view of the human eye and avoiding a prismatic jump (prism) from the prescription zone to the peripheral temporal zone.

According to the optical lens element of the present invention, when mounted in an eyeglass frame, it can be temporarily rotated about a vertical axis passing through its optical center.

According to a further aspect of the present invention there is provided an optical lens element adapted to be mounted in a roll-up or shutter frame such that the lens element is temporarily rotatable about a vertical axis passing through its optical centre, the lens element comprising

Front and back surfaces capable of forming a prescription (Rx) region; and optionally

A peripheral temporal region;

the anterior and/or posterior surfaces are provided with surface correction to at least partially adjust for errors including astigmatism and power errors.

In this embodiment, various optical effects and errors are thus created as the optical axis continues through the wearer's line of sight, as discussed below. However, by appropriate selection of the combination of the front and/or rear surfaces, optical errors may be reduced or eliminated.

According to a further aspect of the invention there is provided an optical lens element adapted to be mounted in a roll-up or shutter frame, the lens element comprising

A peripheral temporal region

Wherein the optical axis is decentered with respect to the geometric axis of the lens element to provide prismatic correction (prism correction),

Applicants have found that it is possible to manufacture an optical lens element, in particular a sunglass lens element, which includes a prescription (Rx) region and which is decentered to provide prismatic correction.

Preferably, the front and/or rear surfaces of the lens element include surface correction to at least partially accommodate prismatic errors caused by lens tilt.

Exemplary optical effects and errors can be summarized as follows:

these effects are described in view of the effects observed by the wearer along a line of sight intersecting the optical axis of the lens element:

astigmatic error

There is an error that induces astigmatism such that astigmatism a is proportional to the power P of the lens and proportional to the square of the lens rotation angle.

Error of focal power

When the lens is used as a roll-up form, the average transmitted power of the lens changes. Its mean power error dP is proportional to the astigmatic error a and to a constant k related to the refractive index of the lens. Thus in the case of negative Rx the negative value of the average power is greater and in the case of positive Rx the positive value of the average power is greater.

Prismatic effect

Due to the rotation of the lens and the tilt angle of the optical axis, a lens prism (lens prism) is generated.

Prismatic off-axis disparity (prism disparity)

Unequal distortion in temporal and nasal fields of view can result in off-axis prismatic differences, resulting in poor binocular vision.

Other important observations:

the lens elements described result in increased off-axis power and astigmatism errors because the background (front) curve is chosen to fit the standard outer frame rather than to achieve optimal optical performance.

These errors can result in unacceptable power errors.

One or more of the following corrections may be made to reduce the error:

mean power error correction

The curvature of the anterior and/or posterior surfaces may be adjusted to compensate for changes in average power due to lens rotation, the degree of correction depending on the balance of on-axis power error tolerable to the wearer and reduced unacceptable off-axis power error.

Thus, to correct the on-axis error, either full power correction for the induced shift in transmitted power may be performed, or partial correction may be performed when off-axis power error is taken into account.

Astigmatic error correction

The anterior and/or posterior surfaces may be at least partially toric to correct for astigmatic errors previously described as being caused by lens rotation. The degree of correction may be a full correction of astigmatism caused by lens rotation, or may be a partial correction, depending on the application. Partial corrections may be made to achieve tolerable on-axis astigmatic error and thereby reduce off-axis astigmatic error.

Prismatic correction

Its optical center can be shifted horizontally to compensate for prismatic shape caused by lens rotation. This can be achieved by applying the prescribed prismatic shape during surfacing or horizontal shifting of the lens elements.

Other considerations

These corrections include, but are not limited to, tilt movement of the wide angle lens, variations in the lens frame form, cosmetic requirements depending on the frame and lens form, and the average distance from the pupil center to the lens.

Off-axis prismatic difference

To correct for off-axis prismatic differences, the lens may include aspheric surfaces on its anterior and/or posterior surfaces.

Aspherization of surfaces

Aspherization of the anterior or posterior surfaces may be used to correct off-axis errors including those caused by tilt and/or background curve selection. Such off-axis errors may include power errors and astigmatism errors, as well as prismatic differences.

However, it will be found that although correction for any particular optical error is fairly straightforward, the correction must be balanced to achieve acceptable overall lens performance.

The following table gives exemplary error corrections that may be performed for different power ranges of the positive (+) and negative (-) lens elements for a typical rotation of about 20 ° about the vertical axis.

It is noted that the eye-side power correction is given assuming that the above errors are all corrected to compensate for the sphere Rx defined at the optical center. If desired, less correction can be made to achieve acceptable overall lens performance.

Thus, according to a preferred aspect, the optical lens element comprises

An anterior and/or posterior surface having a surface curvature adjusted to partially compensate for the central average transmitted power error; and

a second surface correction to at least partially balance off-axis and on-axis astigmatic errors.

According to another preferred aspect, the second surface correction may include a toric portion on an anterior and/or posterior surface thereof to at least partially correct astigmatic error.

The lens correction included in the optical lens element of the present invention can be classified into two types:

correction caused by rotation of the lens about the optical axis, or astigmatism and power error correction,

and the correction required by the wearer's prescription, or prescription correction.

According to a preferred aspect, the front surface may include a base curvature suitable for high base curve lenses, for example for roll-up applications. The features of the front surface may primarily satisfy cosmetic requirements.

The front and/or rear surface of the optical lens element preferably includes a spherical or toric portion to provide the desired prescription (Rx) in the prescription area.

More preferably, the anterior and/or posterior surfaces include a toric portion and are provided with surface correction to at least partially adjust for on-axis astigmatism and mean power errors. Temporary rotation of the lens when mounted in a roll-up or shutter frame can result in such on-axis errors.

Alternatively, or in addition, the anterior and/or posterior surfaces include an aspheric component selected to at least partially adjust for off-axis astigmatism and mean power error and prismatic variation.

The anterior surface preferably includes such an aspheric component. This off-axis error is due in part to temporary rotation of the lens when mounted in a wrap-around or shutter-style frame, and in part to the choice of a background curvature suitable for high background curve lenses.

According to a further preferred aspect, to provide a peripheral temporal region, the anterior and/or posterior surfaces (preferably the anterior surface) are aspheric surfaces having aspheric coefficients to define the peripheral temporal region.

In another aspect, the peripheral temporal region may be provided by an extension of the anterior and/or posterior surface curvatures, the opposing surfaces of which are adjusted to compensate for the extended surface.

Accordingly, the optical lens element comprises

An anterior surface having a spherical or toric portion designed to provide a desired prescription (Rx) in the prescription zone and with surface correction to at least partially accommodate errors including astigmatism and mean power errors in combination with the posterior surface,

and with suitable coefficients to define the peripheral temporal region; and a transition portion designed to smoothly connect between the prescription region and the peripheral temporal region

A back surface modified to compensate for the front surface.

The anterior surface in the peripheral temporal region is generally preferably spherical. Preferably, the posterior surface is also generally spherical and has an equal curvature to the peripheral temporal region, thereby providing a generally smooth extension.

The posterior surface may preferably include a base curvature to achieve the desired prescribed optical power Rx for the patient. The back surface may be further modified to compensate for the selected front surface.

In accordance with the ophthalmic lens element of the present invention, the posterior surface thereof can, in accordance with a preferred aspect, comprise a toric surface selected to achieve the prescribed optical power and cylindrical correction of the prescribed lens.

According to a preferred aspect, the back surface of the toric surface may further include surface correction to compensate for mean power and astigmatism errors induced when the lens is wrapped (wrap).

According to yet another preferred aspect, the toric surface may be aspheric. The aspheric toric surface may include an adjustment to correct off-axis astigmatism and/or mean power error.

Accordingly, according to a preferred aspect, the optical lens element comprises

A spherical front surface having a base curvature suitable for high base curve lenses, an

A toric back surface having an appropriate curvature to provide the prescribed optical lens power and the prescribed cylindrical lens surface requirements and including an adjustment to correct astigmatism and mean power errors to compensate for lens wrap.

In another embodiment, the optical lens element comprises

A toric front surface having a base curvature adapted for high base curve lenses and including a toric adjustment for astigmatic error correction to compensate for lens wrap, and

a toric back surface having an appropriate curvature to provide the prescribed optical lens power and the prescribed cylindrical surface of the lens.

In yet another embodiment, the optical lens element comprises

An aspheric front surface having a base curvature suitable for high base curve lenses and appropriate aspheric coefficients to correct off-axis power and/or astigmatism errors; and

a toric back surface having an appropriate curvature to provide the prescribed optical lens power and the prescribed cylindrical surface requirements of the lens and including an adjustment for astigmatic error correction to compensate for lens wrap-up.

In a further preferred embodiment, the optical lens element comprises

An aspheric toric front surface having a base curvature suitable for high base curve lenses and including a toric adjustment for astigmatic error correction to compensate for lens wrap, and

The asphericity of the anterior surface may be used to provide appropriate aspheric coefficients to correct off-axis power errors and/or astigmatic errors.

Accordingly, the optical lens element may comprise

An aspheric toric back surface having appropriate aspheric coefficients to correct off-axis power errors and/or astigmatic errors, and including a toric adjustment for performing astigmatism error correction and mean power error correction to compensate for lens wrap, and the prescribed optical lens power and the prescribed lens cylinder.

In another aspect, the optical lens element includes

A toric front surface having a base curvature suitable for high base curve lenses and including a toric adjustment for astigmatic and mean power error correction to compensate for lens wrap, and

an aspheric toric back surface having appropriate aspheric coefficients to correct for off-axis power errors and astigmatism errors, as well as the power of the prescribed optical lens and the cylindrical surface of the prescribed lens.

In yet another alternative embodiment, the optical lens element comprises

An aspheric front surface having a base curvature suitable for high base curve lenses and appropriate aspheric coefficients to correct off-axis power and/or astigmatism errors, an

An aspheric toric back surface having appropriate aspheric coefficients to correct off-axis power errors and/or astigmatic errors, and including a toric adjustment to correct astigmatic error to compensate for lens wrap, and prescribed optical lens power and prescribed lens cylinder.

In yet another alternative embodiment, the optical lens element comprises

An aspheric toric front surface having a base curvature suitable for high base curve lenses, including a toric adjustment for astigmatism error correction to compensate for lens wrap, and having appropriate aspheric coefficients to correct off-axis power errors and/or astigmatism errors, and

an aspheric toric back surface having appropriate aspheric coefficients to correct for astigmatic and mean power errors, and prescribed optical lens powers and prescribed lens cylinder.

In a particularly preferred embodiment, the optical lens element comprises

An aspheric anterior surface having a base curvature suitable for high base curve lenses and suitable aspheric coefficients to define a peripheral temporal region; and

a back surface having an appropriate curvature to provide the prescribed optical lens power and the prescribed lens cylinder, and including adjustments for correcting astigmatism errors and mean power errors to compensate for lens wrap-around.

In this embodiment, the optical power, cylinder, and error correction can all be undertaken by the posterior surface, thereby minimizing the design difficulty of the convoluted anterior surface.

The aspheric anterior surface is preferably line symmetric about its horizontal geometric axis. The aspheric anterior surface may alternatively or additionally be line symmetric about its vertical geometric axis. This line symmetry further simplifies the design of the front lens surface and makes it more aesthetically pleasing.

The aspheric surface preferably includes a correction in the horizontal direction. More preferably, the back surface has a background curvature such that a desired prescription power Rx for the patient can be achieved at the prescription region; the back surface of which is further modified to compensate for the selected front surface.

The aspheric anterior surface may be generally conical in shape.

In accordance with a preferred aspect of the present invention, an ophthalmic lens element can be made from a laminate of front and rear lens elements.

Accordingly, in accordance with a preferred aspect of the present invention, there is provided a laminated optical product adapted to be mounted in a roll-up or apron frame, comprising

A front lens element;

a compensated rear lens element, the front and rear surfaces of the laminated optical product being capable of forming a prescription (Rx) area;

the anterior and/or posterior surfaces having correction to at least partially adjust for errors including astigmatism and mean power errors;

the front and/or rear lens elements optionally include

A peripheral temporal region.

As mentioned above, the laminated product may be temporarily rotated about a vertical axis passing through its optical center, or its optical axis may be off-centered with respect to the geometric axis, or the lens element may be both rotated and off-centered.

Accordingly, in a preferred embodiment of this aspect of the invention, there is provided a laminated optical product for mounting in a roll-up or apron frame such that the lens element can be temporarily rotated about a vertical axis passing through its optical center, the laminated optical product comprising

A front lens element;

a compensated rear lens element, the front and rear surfaces of the laminated optical product being capable of forming a prescription (Rx) area; the anterior and/or posterior surfaces having corrections to at least partially adjust for errors including astigmatic errors;

the front and/or rear lens elements optionally include

A peripheral temporal region.

In a preferred embodiment, the front lens element may be a generally plano lens.

The corresponding rear lens element may comprise a lens element of positive or negative optical power.

The distance power and cylinder profiles can be made between the front and rear lens elements if desired.

Alternatively, the rear lens element may be thicker, and the laminated optical product forms a semi-finished lens.

According to an alternative or additional aspect, the lens element may be modified to allow control of light in the peripheral temporal region. Its peripheral temporal region is preferably modified so that no image is produced in the temporal field.

The peripheral temporal region of the optical lens element of the present invention may be configured to be most aesthetically pleasing. In theory, the peripheral temporal region should exhibit little or no optical difference from the remainder of the ophthalmic lens element. For example, where the prescription Rx surface of the ophthalmic lens is a negative Rx lens, the temporal extension will produce zero or positive refractive power. The temporal extension may be tapered in cross-section to optimize cosmetic effectiveness.

Accordingly, in a preferred aspect, the curvature of the anterior surface is modified in the peripheral temporal region to substantially correspond to the curvature of the posterior surface thereof.

It will be found that the peripheral temporal region so produced is substantially smoothly extending.

The peripheral temporal region may be treated with any suitable coating to optimize the cosmetic appearance of its front surface.

For example, the peripheral temporal region may be designed so that there is a rapid transition from the interface between the temporal region and the refractive power surface so that the vision does not focus on the wearer's eye in the temporal extension. For example, for a negative Rx lens, the minimum degree of nominal power for the temporal portion that should be positive with respect to distance Rx is in the range of about 1 to 1.25D.

It will be found that for a negative Rx lens, it is possible to have only the anterior surface of the lens with the temple region. The posterior surface of the lens may be of a conventional spherical or toric form, with the angle to reach the temporal extension increasing as the base curve of the lens becomes steeper. For lenses with smoother background curves, e.g., 4 or 6D, temporal extension may be reduced compared to lenses with higher background curves. This is useful when the primary purpose of the lens design is to meet cosmetic requirements by eliminating the traditional edge of the negative Rx lens.

According to another aspect, when the anterior surface of the ophthalmic lens forms a positive Rx lens, its peripheral temporal region may vary from a positive lens to an approximately flat lens (e.g., a cylindrical lens). An ophthalmic lens of this construction may be used as a near-piano prescription if the temporal extension is piano or slightly negative in refractive power. If the temple extension maintains a positive power for a higher positive Rx lens, that power may be at least 1 to 1.5D, less positive than Rx.

In a preferred embodiment, the front and back surfaces of the optical lens element may together define a lens of negative power.

The front surface of the lens element in this embodiment may be of generally circular cross-section.

The rear surface of the lens element may be of generally conical cross-section.

The peripheral temporal region of the anterior surface has a generally conical cross-section, thereby providing a generally plain temporal cross-section.

As mentioned above, the lens element may be modified to allow control of the light in its peripheral temporal region. The reflected color of the sunglass lenses is primarily a function of the color of the front surface of the lens. The rear surface of the lens may be mirror coated so that the combination of its front and rear surface reflections achieves a specular brightness (mirror) and creates a perception of the lens color (tint). Alternatively, or in addition, a different colored coating or layer may be provided on the rear surface of the lens. This changes the intensity and spectral characteristics of the transmitted and reflected light rays that interact with the over-tinted regions of the lens.

Alternatively, the front or back surface (particularly the back surface) may frost (frosted) to scatter the reflected and transmitted light beams. That is, the image is not formed by the light beam entering the lens. The frosted portion of the lens is dull (translucent) to the wearer. For others, the lens will reflect all of the colored color from its front surface from the frosted portion of the back surface to form a dark image. The rear surface preferably includes a partial mirror coating that reflects to form a matte finish.

The peripheral temporal region may be manipulated in a variety of ways so that no image is produced in its peripheral field of view, regardless of its optical design. The most straightforward way to simply prevent the visible focused light intensity from passing through by blocking is by any one or combination of the following:

● rear surface gradient mirror

● gradient (black) coloration of rear surface

● rear surface blur

The mirror coating can be performed using conventional techniques, such as vacuum deposition of a metal film on the finished lens. A chemical solution of the original metal layer may be deposited on a portion of the mold and the lens cast from the mold. The metal mirror so formed of copper, nickel or any selected metal is transparent to sufficient light to produce any interference pattern, exhibiting a mild matte finish.

Alternatively, or additionally, the temple extension may include one or more of the following:

● reflection holographic film: specular reflective polymer sheets, for example about 0.5mm thick, can produce bright colors, changing the reflected color pattern

● light control film: e.g. polycarbonate films, e.g. 0.8mm thick, confine transmitted light to a narrow angular range

● reflective film: e.g., mylar, 0.025mm thick, 10% transmission/90% reflection

● liquid crystal film: e.g., a polymer sheet, 0.20mm thick, the color of the full spectrum is changed by changing the temperature.

The ophthalmic lens may be made of any suitable material. Polymeric materials may be employed, which may be of any suitable type. The polymeric material may comprise a thermoplastic or thermoset material. A material of the hexadiene glycol carbonate (diallyl carbonate) type may be used.

The polymer particles may be made from a cross-linked polymer casting composition, for example as described in U.S. Pat. No. 4,912,155, U.S. patent application No.07/781,392, Australian patent applications 50581/93 and 50582/93, and European patent Specification EP453159A2, the entire disclosures of which are incorporated herein by reference.

The crosslinked polymeric casting composition may comprise a diacrylate or dimethacrylate monomer (e.g., polyoxyalkylene glycol diacrylate, or polyoxyalkylene glycol dimethacrylate, or bisphenol fluorene diacrylate or dimethacrylate) and a polymerizable copolymer such as methacrylate, acrylate, vinyl ether, allyl, aromatic hydrocarbon, ether, polythiol, and the like.

For example, in Australian patent application 81216/87 (the entire disclosure of which is incorporated herein by reference), applicants describe a cross-linking type coating composition comprising at least polyoxyalkylene glycol diacrylate or dimethacrylate and at least one polyfunctional unsaturated cross-linking agent.

Further, in Australian patent application 75160/91 (the entire disclosure of which is incorporated herein by reference), the applicant describes polyoxyalkylene glycol diacrylate or dimethacrylate; a homopolymer having repeat units derived from at least one free radical initiated polymerizable bisphenol homopolymer capable of forming a homopolymer having a high refractive index greater than 1.55; and a urethane monomer having 2 to 6 terminal groups selected from the group consisting of acrylic groups or methacrylic groups.

The polymer composition is uv cured or cured by a combination of uv treatment and heat treatment. A series of optical lenses sold by the applicant under the trade name "Spectralite" has been found to be suitable.

The polymeric material may include a dye, particularly a photochromic dye, which may, for example, be incorporated into a monomeric component used to make the polymeric material. Variations in color depth can be minimized by adding pigments or dyes to one or more layers of the optical material.

The ophthalmic lens elements of the present invention may further comprise standard additional coatings, including electrochromic films, on the front or back surfaces.

The front lens surface may have an anti-reflection (AR) coating, such as the type described in U.S. patent No.5,704,692, the entire disclosure of which is incorporated herein by reference.

The front lens surface may have a wear resistant coating, such as the type described in U.S. Pat. No. 4,954,591, the entire disclosure of which is incorporated herein by reference.

In a particularly preferred form, the laminated ophthalmic article may include an inner layer that provides the desired optical properties, such as of the type described in International patent application No. PCT/AU96/00805, the entire disclosure of which is incorporated herein by reference.

The front and back surfaces may further include one or more additional ingredients commonly employed in casting compositions, such as antioxidants, dyes including heat-sensitive or light-sensitive dyes, such as described above, polarizers, uv stabilizers, and materials that can alter the refractive index.

In accordance with yet another aspect of the invention, the optical lens element can be modified to an enhanced profile in the nasal region.

Accordingly, the optical lens element may include a region of reduced or opposite curvature defining a nasal side enhancement region.

In a more preferred form, the lens element may reach anteriorly to the bridge of the nose and posteriorly to the temple.

According to yet another aspect of the invention, there is provided eyewear comprising

A roll-up spectacle frame for carrying a pair of optical lenses such that each lens can be temporarily rotated about a vertical axis passing through its optical center; and

a pair of optical lens elements, each lens element comprising

Front and/or rear surfaces capable of forming a prescription (Rx) surface; and optionally

A peripheral temporal region;

the anterior and/or posterior surfaces are provided with surface correction to at least partially adjust for errors including astigmatic errors.

The front and rear surfaces of the optical lens element may be of the form described above. The optical lens element may be decentered.

The spectacle frame according to this aspect of the invention may be of any suitable form. The spectacle frame may allow the interpupillary distance to be adjusted, for example, by fixing the lens in a frame mount. Rimless or temple link frames may be used.

The ophthalmic lenses mounted in the frame may be made from semi-finished lenses or front and rear lens wafers as described above. Ophthalmic lenses may have prescription surfaces with positive or negative optical power.

According to a further aspect of the invention, there is provided a method of designing an optical lens element for mounting in a roll-up or shutter frame, the method comprising

Provide for

A mathematical or numerical expression comprising the surface of the optical lens element designed to provide a desired prescription (Rx) portion in the prescription zone; and optionally, adding a mathematical or numerical expression of the peripheral temporal region thereto to define a complete lens surface;

rotating and/or decentering the lens surface representation to enable it to be mounted in a suitable frame; and

the expression for the lens surface is modified to at least partially accommodate errors including astigmatism and mean power errors.

According to a preferred aspect, the method may comprise

Providing a mathematical or numerical expression of an aspheric front surface of an optical lens element comprising a portion designed to provide a desired prescription (Rx) in a prescription region and having appropriate aspheric coefficients to define a peripheral temporal region;

rotating and/or decentering the representation of the lens surface to enable it to be mounted in a suitable frame;

then providing a mathematical or numerical expression of the back surface of the prescription (Rx); and

the expression for the lens surface is modified to at least partially adjust for prismatic and/or astigmatic errors.

Preferably, the method comprises

Provide for

A mathematical or numerical expression comprising the surface of the optical lens element designed to provide a desired prescription (Rx) portion in the prescription zone; and add thereto

A first mathematical or numerical expression of a peripheral temporal region; and

a second mathematical or numerical expression designed to smoothly connect the prescription portion and the transition portion of the peripheral temporal region to define a complete lens surface;

In a particularly preferred form, the aspheric anterior surface is a toric anterior surface. The toric front surface has line symmetry along its horizontal and/or its vertical axis.

In a further preferred form, the posterior surface thereof is a toric posterior surface.

In a preferred form, the aspheric front surface has an additional correction in the horizontal direction to adjust for errors due to rotation.

General expression of the cross section of a spherical or aspherical lens surface can be obtained by coordinates

sag＝A₂R²+A₄R⁴+A₆R⁶+A₈R⁸

Wherein R is the radius measured from the optical axis, A₂，A₄，A₆And A₈Are coefficients defining the optical power and the asphericity. The lens is assumed to be rotationally symmetric about its optical axis.

Then

R²＝x²+z²

Wherein the x-axis is orthogonal to the optical axis (y) in a direction toward the temple and the z-axis is perpendicular to the wearer's face.

Asphericity is used in conventional lens designs to produce a slight shift to the spherical shape, with the power component defined by the surface curvature

T＝[d²y/dr²]/[1+(dy/dr)²]^3/2Tangential direction

S＝[dy/dr]/r[1+(dy/dr)²]^1/2Sagittal of arc

Wherein sag is represented by y.

The surface optical power of the lens is thus defined by the following two derivatives

dy/dr＝2A₂R+4A₄R³+6A₆R⁵+8A₈R⁷And is and

d²y/dr²＝2A₂+12A₄R²+30A₆R⁴+56A₈R⁸。

outer edge of ring surface

The toroidal geometry is conveniently established by considering the total SAG as the result of the addition of a "DSAG" component to the background lens design curve, where the "DSAG" component results from exceeding a certain radius R₀And by a set of similarity coefficients and radial dimension (R-R)₀) The calculation is limited. In this case

sag＝SAG R≤R₀

sag＝SAG+DSAG R≥R₀

Wherein R is₀An outer edge defining a temple region; and is

DSAG＝B₂(R-R₀)²+B₄(R-R₀)⁴+B₆(R-R₀)⁶+B₈(R-R₀)⁸

Wherein B is₂，B₄，B₆And B₈Are coefficients defining the optical power and the asphericity.

The first and second derivatives of the sag being the sum of two separate derivatives thereof

dy/dr→dy₁/dr)_r＝R+dy₂/dr)_r＝R-R0

d²y/dr²→d²y₁/dr²)_r＝R+d²y₂/dr²)_r＝R-R0

By definition, where R ═ R₀Where y and dy/dr are both continuous, but the second order differential is discontinuous.

In this model, the sagittal surface curvature is continuous, and the tangential surface curvature is discontinuous, unless the following condition is satisfied

B₂＝0

Generalized torus equation

If we generalize the formula to

sag＝SAG+α(DSAG)^N R≥R₀When the temperature of the water is higher than the set temperature,

wherein alpha and N are numerical parameters which are more than or equal to 1, the method can obtain more freedom when establishing a surface model, and can better control the change of surface focal power when calculating the curvature of the toric surface. If one of the following conditions is satisfied, then the first and second derivatives thereof are R ═ R₀Is continuously treated

2 > N ≥ 1 and B₂0 or

For B₂All values N are greater than or equal to 2.

We have readily found a general expression for continuous surface curvature in both the sagittal and tangential directions. That is, we can create a toric shape without discontinuities in the surface power. Given such a surface shape, we can place one surface behind another with a similar generation equation to provide a lens with a high curvature, but without discontinuities in the refractive power of the entire lens.

When calculating and plotting the curves obtained from the above model at N-1 and N-2, it is clear that this toric plate curves progressively towards the central optical zone, assuming B is known₂The case (1). The model deviates very gently from the design sphere, fusing the optical parameters of the two design regions.

Further generalization of the torus equation

It will be appreciated that the surface of the lens element is a surface of revolution swept by any of the sag expressions described above with respect to a selected axis of revolution. In the above mathematical derivation, we have indicated rotational symmetry around the optical axis. The lens shape thus produced has the same average surface power in the horizontal and vertical meridians, with a peripheral temple region around the entire circumference of the lens element.

Before such lens elements can be mounted in close proximity to the face in a roll-up frame or shield, the temporal extensions are cut away except at locations corresponding to the temples of the roll-up eyewear.

In an alternative embodiment, the SAG curve can be suitably surface transformed by rotating the SAG curve in the horizontal meridian plane about an axis parallel to the x-axis. The curvature for providing the temple extension of the lens is thus located towards the end of the horizontal meridian, while its vertical curve can maintain the conventional spherical or aspherical lens shape.

The surface sag of the lens element produced in this way is expressed by

For x ≦ x₀

For x ≧ x₀

If the parameter A is_2nAnd C_2nSet equal, then the optical zones have the same surface power in the vertical and horizontal meridians.

If the parameter C_2nThe focal power of the corresponding curve is lower than the parameter A_2nThe optical power of the defined curve is lower than the surface power of the optical area on the vertical meridian. The lens element made in this way helps to match the wrap-around eyewear to the face. The high base curve of class B or 9D can be used to wrap laterally to the temple. However, a low background curve, for example, about 2 to 5D, matches the vertical profile of the face, so that the lens is positioned closer to the eye and does not press against the eyebrows or cheeks.

Using this more general background curve to define the vertical meridian also reduces the need for off-axis astigmatism and power correction at that meridian.

The invention is explained in more detail below with reference to the figures and examples. It should be understood, however, that the following description is illustrative only and should not be taken in any way as limiting the scope of the invention described above.

In the drawings:

fig. 1 shows the light path through a lens surface with the color of sunglasses.

Fig. 2 is a simplified diagram of an ophthalmic lens with negative Rx power (right lens).

FIG. 3 is a simplified diagram of a peripheral temporal region of an ophthalmic lens having a positive Rx surface.

FIG. 4 is a schematic side view of an ophthalmic lens with a negative Rx surface according to the present invention.

Figure 5 is a cross-sectional view of a front surface laminate of a series of piano, positive and negative lenses according to the invention. Each front surface is rotationally symmetric.

Fig. 6 is a diagrammatic view of a positive and negative surface sheet for lamination to the front surface shown in fig. 5. Cylindrical correction may be performed on the posterior surface thereof.

Fig. 7(a) is a semi-finished optical blank: -polishing the optical surface (1), -polishing the non-polished back surface (1'), rotating the axis of symmetry (3), -the desired optical axis (4). In this example, the billet diameter is 76mm, the front surface curve is 8D, and the angle between axes (3) and (4) is 20 °. The thickness of the blank is about 15mm according to design requirements.

Fig. 7(b) shows a second optical surface (2) which is rotationally symmetrical about the optical axis (4) and which is produced by grinding and polishing the front surface of the optical blank. (1) And (2) the difference in power is the final Rx power of the lens. In this example, (2) is 4D.

FIG. 7(c) shows the final Rx lens with a power of-4D and a central optic zone width of 35 around the optical axis (4). The curve (5) has the same power as (1) centered on the axis (4). The temporal limit of the plano edge of the lens (upper part in the figure) is 88 from the forward line of sight for a 28mm distance of the posterior apex.

Fig. 8(a) is a pure piano lens with a 9D background curve. Curves (6) and (7) are both 10D centered on the optical axis (4). When considering the geometric axis of the offset, the apparent "in-line" prismatic shape of the lens is noted. The nasal (lower) portion of the lens is thicker.

Fig. 8(b) is the final Rx lens, with a power of-4D, produced by curve (8) of 5D centered on the optical axis (4).

Fig. 9(a) is a pure piano lens with a 10D background curve. Curves (9) and (10) are both 10D centered on the optical axis (4). When considering the geometric axis of the offset, the apparent "in-line" prismatic shape of the lens is noted. The nasal (lower) portion of the lens is thicker.

FIG. 9(b) is the final Rx lens, with a power of-4D, resulting from curve (11) of 6D centered on the optical axis (4). The optical zone width was ± 45 ° for a 28mm posterior apex distance and the temporal limit of the plain edge was 95 °.

Fig. 10(a) is a pure piano lens with a 12D background curve. The curves (12) and (13) are both 12D centered on the optical axis (4). When considering the geometric axis of the offset, the apparent "in-line" prismatic shape of the lens is noted. The nasal (lower) portion of the lens is thicker.

FIG. 10(b) is the final Rx lens, with a power of-4D, produced from the blank shown in FIG. 7 (a); the curve (14) is 8D centered on the optical axis (4). The optical zone width was ± 45 ° for a 28mm posterior apex distance and the temporal limit of the plain edge was 98 °.

FIG. 11(a) is a final Rx lens of power +4D, made from a semi-finished blank molded with a rear mold surface of similar form to the front lens surface shown in FIG. 7 (c); curve (15) is-8.2D centered on axis (4) to define the final lens thickness, and curve 16) is 4D centered on axis (4). The optical zone is centered around the optical axis (4) ± 35 °, and the virtual plano-temporal edge (upper part of the figure) extends 87 ° from the forward line of sight for a 28mm distance of posterior vertices.

Fig. 11(b) is the final Rx lens, with power + 4D: curve (17) is 10.2D centered on axis (4) to define the final lens thickness, and curve (18) is 6D centered on axis (4). The optical zone is around the optical axis (4) ± 40 °, and the virtual plano-temporal edge (upper part of the figure) extends 95 ° from the forward line of sight for a 28mm posterior apex distance.

Fig. 11(c) is the final Rx lens, with power + 4D: curve (19) is 12.25D centered on axis (4) to define the final lens thickness, and curve (20) is 8D centered on axis (4). The optical zone is 48 ° around the optical axis (4) and the virtual plano-temporal edge (upper part of the figure) extends 98 ° from the forward line of sight for a 28mm distance of posterior vertices.

FIG. 12(a) is a schematic diagram of a pair of negative lens elements according to the present invention having a transmitted optical power of-3.0D, rotated 20 about their perpendicular optical axis.

FIGS. 12(b) and (c) show the resulting mean surface power contours and astigmatism contours after rotation of the lens of FIG. 12 (a).

FIGS. 12(d) and (e) show the resulting mean surface power contours and astigmatism contours after the lens back surface of FIG. 12(a) has undergone full correction of the desired mean transmitted power.

Fig. 12(f) and (g) show the resulting mean surface power contours and astigmatism contours after the lens back surface of fig. 12(a) has undergone further total toric back surface correction.

Fig. 12(h) and (i) show the resulting mean surface power contours and astigmatism contours after the lens back surface of fig. 12(a) is subjected to further partial toric back surface correction.

Fig. 12(j) and (k) show the mean surface power contours and astigmatism contours obtained after the lens posterior surface of fig. 12(a) is subjected to partial mean power correction and partial toric posterior surface correction.

Fig. 13(a) is a schematic diagram of a pair of flat lens elements according to the present invention, having a transmission power of 3.0D, rotated 20 ° about their vertical optical axis.

FIGS. 13(b) and (c) show the resulting mean surface power contours and astigmatism contours after rotation of the lens of FIG. 12 (a).

FIGS. 13(d) and (e) show the resulting mean surface power contours and astigmatism contours after the lens back surface of FIG. 12(a) has undergone full correction of the desired mean transmitted power.

FIGS. 13(f) and (g) show the resulting mean surface power contours and astigmatism contours after the back lens surface of FIG. 12(a) has undergone further full toric front surface correction.

FIGS. 13(h) and (i) show the resulting mean surface power contours and astigmatism contours after the back lens surface of FIG. 12(a) has undergone further partial toric front surface correction.

FIG. 14(a) is a schematic diagram of a pair of aspheric negative lens elements according to the invention having a transmission power of-3.0D, rotated 20 about their perpendicular optical axis.

Fig. 14(b) and (c) show the mean surface power contours and astigmatism contours resulting from the lens element undergoing aspherization of the anterior surface and total toric posterior surface correction.

Fig. 15 and 16 show a series of laminated optical positive (+) lens elements.

Fig. 17 shows a laminated optical negative (-) lens element.

Figure 18 shows a laminated or compound-surface negative lens element in which the thickness of the laminated assembly is adjusted by selecting a different diameter posterior element to vary the size of the optical zone of the final lens.

Figures 19 and 20 show an optical lens element including a temple generally plano extension with a modified curvature.

Fig. 21 to 29 show positive and negative optical lens elements whose front surfaces are represented by the following formula

sag＝SAG R≤R0，

sag＝SAG+DSAG R≥R0

And forms an optical zone that gives the required Rx correction and a peripheral temporal zone with a simple spherical or toric posterior surface.

Figure 21 shows a positive lens with a plano-temporal extended +2D power.

Fig. 22 and 23 show a positive lens of +4D power. The lens in fig. 22 has a smooth transition to the plano-temporal extension with a design parameter N of 2. The lens of fig. 23 has a less satisfactory discontinuity in the front surface power, with a design parameter N of 1.

FIGS. 24 and 25 show a lens having an optical power of-4D. The lens in fig. 24 has a smooth transition to the plano-temporal extension with a design parameter N of 2. The lens of fig. 25 has a less satisfactory discontinuity in the front surface power, with a design parameter N of 1.

Fig. 26-28 show similar positive and negative optical lens elements, produced by joining two different surfaces of a standard conical design, but with different optical powers corresponding to the optical zone and temporal extension. Like the lenses shown in fig. 23, these lenses exhibit either meridional or sagittal curvature discontinuities at the transition between the two design regions. This in turn requires that the surface be optimized by standard beam tracking techniques, whenever possible, to minimize astigmatism and blur created by the transition between the optical zone and the temporal extension.

Fig. 29 and 30 show similar optical plus and minus lens elements with a generally plano-optic temporal extension.

Example 1

The process for making an ophthalmic lens with negative Rx is as follows:

these lenses may be fabricated as finished lenses or, preferably, provided from semi-finished blanks. For molding the finished lens, the rear mold may be a conventional rear mold such as a spectral (Spectralite) type without modification. For the semi-finished blank, the rear lens surface is ground and polished in each standard procedure. The main difference between these two cases is that the surrounding curve of the front mold becomes a steep toric design. Side-filled tubular packings are suitable for both product forms.

Semi-finished (S/F) blanks are typically used to provide a range of master pieces from each background curve, and contain different interpupillary distances (PD' S) and different frame shapes and sizes. For all of these lens versions, a particular frame version may be used, with the shape of the lens so cut being substantially unchanged.

In addition, the S/F blank must provide a defined Rx range, a single PD and a basic temple extension curve. The higher the negative element produced, the steeper the curve, the steeper the radius from the optical center to the temporal edge (i.e., the smaller the PD, all other factors remaining constant), the steeper the curve.

Fig. 4 shows the geometry of a typical S/F blank. The amplitude of the front toric curve of the blank extending downward to the outer edge is at least the depth required for the highest recommended negative power for the nominal background curve (including cylindrical surface). It is not constant in all directions. The individual S/F blanks were decentered to obtain the general PD' S spread. The particular radius of the blank is chosen to be the horizontal meridian of the finished lens, defining both the feasible PD and the true power of the horizontal meridian. The blank may be obtained by ink marking and aligning a caliper to correct the orientation when the surface is edged. Edging, however, does not remove the desired temporal curvature.

The obtained series of spherical power lenses was substantially similar to the S/F blank of the above-described construction except that the rear surface thereof was also optically polished.

Example 2

An ophthalmic lens similar to that of example 1 was produced, except that the geometric shape and optical center of the lens were not deviated. Such lenses are used with frame systems that allow the PD to be set by fixing the lens to the frame making, rather than by offsetting the geometric and optical centers of the lens.

Example 3

Single point cutting devices for producing the desired surfaces (spherical and cylindrical). Alternatively, a resilient finished polishing pad may be used to achieve an optical zone surface with a good optical finish, the minimum finish of its posterior temporal "lip" being sufficient. The toric portion of the lens obtained was translucent, although no mark could be produced. A gradient mirror is plated on this area to obtain Rx.

Example 4

Ophthalmic lenses according to the invention are passed through conventional lamination systems, e.g. Matrix^TMSystems, made by laminating a pair of front and rear sheets, are described in US5,187,505, US5,149,181 and US5,323,192, the entire disclosures of which are incorporated herein by reference. The interface curve of the lamination system needs to be rotationally symmetric around the optical axis in order to select the cylinder (cyl) axis depending on the original. Therefore, the geometric and optical centers of the lenses are not deviated in the produced lens sheet.

The diameter of the lamella is about 80mm, the conventional optic zone is about 55mm diameter central zone, and the temporal "toric" edge is curved more steeply. As shown in fig. 5 and 6. Its temporal extension effect is an overbending of at least 10 to 15 mm. This is a key feature of the design philosophy; the resulting geometry of the asymmetric edging of the lens is produced with the aim of adapting to the eyebrows. The nasal side of the edged lens is all spherical, while in other parts it is excessively curved to reach near the eyebrows and around the temples.

Example 5

Series lenses according to the invention, having plain or negative refractive power, are made from conventional spherical S/F blanks of the form shown in figure 7 (a). The front (polished) optical surface of the blank is first mounted on an eccentric tool holder such that the axis of rotation for forming and polishing the rear surface of the blank is offset from the nominal axis of the blank by an angle of, for example, about 20. Next, an optical surface having exactly the same power as the front surface of the blank but centered on the off-axis is made on the back (concave) surface of the blank, thus obtaining a true plano lens with a separate optical and geometric axis. The plano lens is similar in form to a lens having an in-line prism, and the nasal side of the lens is thicker than the temporal portion side (fig. 8(a), 9(a) and 10 (a)). There is indeed no prismatic shape, except that the plano lens is designed to have the same optical precision as any other part of the Rx range. The fabrication of a truly flat section with the optical axis properly aligned is necessary for high background curves, e.g., above 9D, but is generally negligible in lower quality sunglasses.

Next, the rear surface of the plano lens is fixed by eccentrically rotating it about a limiting axis. Then, a desired secondary optical surface centered on the optical axis is formed on the front surface thereof and polished, the difference in power between the surface and the original surface being the spherical power of the last Rx, and the newly formed optical surface defining the actual optical area of the dioptric lens (fig. 7(b) and (c)). The lens planus, which surrounds this optical zone, provides the temple extension required for the lenses of the invention. It increases with increasing background curve as shown in fig. 7 to 10 for-4D Rx lens. For the example in the figure, the temporal extension increases from 88 ° to 98 °, and the background curve increases from 8D to 12D. The corresponding optical zone widths range from + -35 deg. to + -45 deg. as the background curve increases.

Obviously, the order of fabrication of the two optical surfaces can be reversed as desired. This typically occurs where a cylinder must be applied to the posterior surface to correct for astigmatism.

For the positive lenses of the invention, no secondary optical surface is applied to the front optical surface of the S/F blank. In addition, the rear surface has a compound shape with respect to the +4D Rx lens as shown in fig. 11. The compound back surfaces of these lenses, curves (15) + (16), (17) + (18) and (19) + (20), are obtained around the optical axis by using a computer controlled device such as a Coburn IQ generator or one of several precision optical lathes available in the industry and polished by an elastic or non-swelling polishing pad used in the industry to meet ophthalmic requirements. The optical zone of which is defined by a central optical zone on the rear surface of the polishing lens. As the background curve increases from 8D to 12D, its breadth increases from ± 35 ° to ± 48 °, while its temporal part's range of action increases from 87 ° to 98 °. Obviously, the same process can be used to make a negative power lens that maintains a simple front surface curve and is designed with a complex back surface that mates with it. It will also be appreciated that all of the surfaces described herein may include a cylindrical portion (preferably on the posterior curve) to correct for astigmatism.

To limit the overall thickness of the positive lenses, it is desirable to minimize the apparent inline prismatic effect of these true plano lenses on these high background curves. The power of the sphere of the posterior surface of the temporal extension of the positive lens is thus made slightly higher than the curve of its anterior surface, so that the temporal extension has approximately the same thickness throughout. The result is that the temporal extension has a slightly negative power, on the order of 0.25D for the highest background curve (about 12D). This refractive power is unnoticeable to most wearers and we therefore refer to this temporal extension as "virtual applanation".

All lenses described in this example can be made by casting the monomer in a mold shaped to produce the surface shape after polymerization. In which case the compound surfaces of the positive and negative Rx lenses are preferably disposed on the rear surface of the lens element. These surfaces are then made as convex surfaces on the respective back molds, thereby facilitating the milling process. In this configuration, the positive and negative Rx lenses have the same front surface shape so that the appearance of the sunglasses is independent of the wearer's prescription. Cylinders to correct astigmatism can be similarly added, and can be made with an approximately shaped posterior mold according to the desired prescription. Alternatively, a slight cylindrical surface, up to around 1.50D, may be created by grinding and polishing the secondary curve on the front surface of the lens of appropriate spherical power. This will satisfy approximately 95% of the cylindrical correction for most people.

Example 6A: negative lens

The following examples describe lens elements made in accordance with the present invention.

A 0 c wide-angle tilt lens was manufactured using the following curve to achieve the prescribed transmission powers of-3.0D and 0.00D cylindrical lenses (see fig. 12 (a)).

Spherical front surface curve 6.00D (1.530)

Spherical back surface curve 9.18D (1.530)

A lens with a vision correction is produced in such a way that

Average transmitted focal power-3.00D

Resulting in on-axis optical cylinder of 0.00D

The lens is rotated by 20 DEG in the temporal direction around the vertical optical axis (see FIG. 12(a))

This produces the following optical effects

Average transmitted focal power-3.33D

The generated on-axis optical cylinder is 0.42D @90 DEG

Fig. 13(b) and (c) show the mean surface power contours and astigmatism contours obtained with respect to the lens surface coordinates.

Example 6B

The total mean power is corrected.

The back surface curve was adjusted to achieve the full correction of the desired average transmitted optical power of-3.00D. This produces the following optical effects

Rear surface curvature ═ 8.87D (1.530)

Average transmitted focal power-3.00D

The generated on-axis optical cylinder is 0.36D @90 DEG

Fig. 12(d) and (e) show the mean power contour and astigmatism contour obtained with respect to the lens surface coordinates.

Example 6C

All mean power corrections and all astigmatic toric posterior surface corrections. The back surface curve is adjusted to achieve the full correction of the desired average transmitted power of-3.00D, and a toric back surface correction is also performed to achieve full astigmatism correction. This produces the following optical effects:

average back surface curvature 8.87D (1.530)

Sagittal rear surface focal power 8.69D (1.530)

Afternoon surface focal power of 9.05D (1.530) toric 0.36D @0 °

Average transmitted focal power-3.00D

Resulting in on-axis optical cylinder of 0.00D

FIGS. 12(f) and (g) show the mean power contour and astigmatism contour obtained with respect to the lens surface coordinates.

Example 6D

Total mean power correction and partial toric posterior surface correction.

The back surface curve was adjusted to achieve the full correction of the desired average transmitted optical power of-3.00D. And partial toric back surface correction to balance off-axis and on-axis astigmatic errors. This produces the following optical effects.

Average back surface curvature 8.87D (1.530)

Sagittal rear surface focal power 8.76D (1.530)

Meridian surface focal power of 9.00D (1.530) toric surface 0.25D @0 °

Average transmitted focal power-3.00D

The generated on-axis optical column mirror is 0.11D @90 DEG

Fig. 12(h) and (i) show the mean power contour and astigmatism contour obtained with respect to the lens surface coordinates.

Example 6E

A partial mean power correction and a partial toric posterior surface correction.

Adjusting its central average transmitted power to partially correct the required transmitted power and reduce the amount of unacceptable off-axis power error. Partial toric back surface correction was performed to balance off-axis and on-axis astigmatic errors. This produces the following optical effects:

average back surface curvature of 9.12D (1.530)

Sagittal rear surface focal power 8.98D (1.530)

Meridian surface focal power of 0.26D (1.530) toric surface of 0.27D @0 °

Average transmitted focal power-3.25D

The generated on-axis optical column mirror is 0.12D @90 DEG

FIGS. 12(j) and (k) show the mean power contour and astigmatism contour obtained with respect to the lens surface coordinates.

Example 7A: positive lens

A 0 c wide-angle tilted lens was manufactured using the following curve to achieve the prescribed transmission powers of +3.0D and 0.00D cylindrical lenses (see fig. 13 (a)).

Spherical front surface curve 6.00D (1.530)

Spherical back surface curve 2.92D (1.530)

A lens with a vision correction is produced in such a way that

Average transmitted focal power of +3.00D

Resulting in on-axis optical cylinder of 0.00D

The lens is rotated by 20 DEG in the temporal direction around the vertical optical axis (see FIG. 13(a))

This produces the following optical effects

Average transmitted focal power of +3.36D

The generated on-axis optical column mirror is 0.46D @90 DEG

Fig. 13(b) and (c) show the mean power contour and astigmatism contour obtained with respect to the lens surface coordinates.

Example 7B

The total mean power is corrected.

The back surface curve is adjusted to achieve the full correction of the required average transmitted power of + 3.00D. This produces the following optical effects

Spherical front surface curvature ═ 6.00D (1.530)

Rear surface curvature 3.23D (1.530)

Average transmitted focal power of +3.00D

The generated on-axis optical cylinder is 0.41D @90 DEG

Fig. 13(d) and (e) show the mean power contour and astigmatism contour obtained with respect to the lens surface coordinates.

Example 7C

All mean power corrections and all astigmatic toric anterior surface corrections. The back surface curve is adjusted to achieve the full correction of the required average transmitted power of +3.00D, and a toric front surface correction is also performed to achieve full astigmatism correction. This produces the following optical effects:

average back surface curvature 3.32D (1.530)

Sagittal front surface focal power 5.82D (1.530)

Meridian front surface focal power of 6.18D (1.530) toric 0.36D @0 °

Average transmitted focal power of +3.00D

Resulting in on-axis optical cylinder of 0.00D

FIGS. 13(f) and (g) show the mean power contour and astigmatism contour obtained with respect to the lens surface coordinates.

Example 7D

Total mean power correction and partial toric anterior surface correction.

The back surface curve is adjusted to achieve the full correction of the required average transmitted power of + 3.00D. And partial toric front surface correction to balance off-axis and on-axis astigmatic errors. This produces the following optical effects.

Average back surface curvature 3.32D (1.530)

Sagittal front surface focal power 5.91D (1.530)

Meridian front surface focal power of 6.09D (1.530) toric 0.18D @0 °

Average transmitted focal power of +3.00D

The generated on-axis optical cylinder is 0.22D @90 DEG

FIGS. 13(h) and (i) show the mean power contour and astigmatism contour obtained with respect to the lens surface coordinates.

EXAMPLE 8 aspherical negative lens

Aspherical anterior surface correction and toric posterior surface correction (see fig. 14 (a)).

In a similar manner to example 6C above, the back surface thereof was adjusted to achieve the full correction of the desired average transmitted power of-3.00D, and also toric back surface correction was performed to achieve full astigmatism correction.

Aspheric front surface correction is performed to reduce off-axis astigmatism errors and power errors.

This produces the following optical effects:

average back surface curvature ═ 9.05D (@1.530)

Sagittal posterior anterior surface focal power 8.67D (@1.530)

Meridian front surface focal power ═ 9.05D (@1.530)

Average transmitted focal power-3.00D

Resulting in on-axis optical cylinder of 0.00D

Aspheric front surface

The height of the front surface at radius r is given by:

Z＝a₀r⁰+a₁r¹+a₂r²+a₃r³+a₄r⁴+a₅r⁵+a₆r⁶+a₇r⁷+a₈r⁸

wherein a is₀To a₈Is a constant value coefficient.

Background curve 6.00D

a₀＝a₁＝a₃＝a₅＝a₇＝0.0

a₂＝0.5660377×10^-2

a₄＝-0.19050×10^-6

a₆＝0.65054×10^-10

a₈＝-0.17067×10^-13

Fig. 14(b) and (c) show the mean power contour and astigmatism contour obtained with respect to the lens surface coordinates.

Example 9

Aspherical surface lens element

An optical lens element containing a peripheral temporal region was made from a front surface 9 background aspheric flattening element and a plurality of rear surface spherical positive lens elements laminated to its rear surface.

Its surface is defined using standard mathematical approximations. The surface properties are given in table 1 below.

The resulting lens element is schematically depicted in fig. 15.

Example 10

Example 9 was repeated using rear lens elements of the same refractive power (+4D and +6D) but of reduced diameter. The angular extent of its respective optical zones is reduced and the overall laminated lens is substantially thinned.

Its surface is defined by using standard mathematical approximations. The surface properties are given in table 2 below.

The resulting lens element is schematically depicted in fig. 16.

Example 11

Example 9 was repeated with rear lens elements of-4D and-8D refractive power, where the edges of these elements were curved parallel to the line of sight at these edges, or steeper, so that the wearer experienced an abrupt change from the optic zone to the plano-temporal extension without any intermediate optical transition or distortion.

Its surface is defined by using standard mathematical approximations. The surface properties are given in table 3 below.

The resulting lens element is schematically depicted in fig. 17.

Example 12

An optical lens element containing a peripheral temporal region was made from a front 9D background aspheric front surface along with rear-4D and-8D background spherical rear surfaces. The rear surface may be made by a lamination process as described in example 1 above or integrally made by cutting on an NC milling machine or standard optical machining equipment with an additional final finishing step to remove sharp burrs that may be present at the boundary of the optical zone and integral temple extension.

Its surface is defined by using standard mathematical approximations. The surface properties are given in table 4 below.

The resulting lens element is schematically depicted in fig. 18.

Example 13

Toric lens element

An optical lens element is fabricated using a circular front surface and a tapered back surface with a modified plano-optic extension.

The front or rear surface thereof may be made by laminating together front and rear lens elements or integrally formed by cutting on an NC milling machine.

Its surface is defined by using standard mathematical approximations.

The surface properties are given in table 5 below.

The resulting lens elements are schematically depicted in fig. 19.

Fig. 20 shows a lens element similar to that in fig. 19. The surface properties are given in table 6 below.

It is noted that the anterior piano section described in this example has an optic zone and a temple zone of high curvature which together define a piano lens with a substantially constant thickness extending through the central zone and including the temple extension. This is another different approach to achieving flat sunglasses or safety glasses than the approach described in U.S. patent No.5,604,547 to Gentex.

To eliminate off-axis astigmatism errors and power errors of the plano-optic elements, an aspheric front surface correction was further performed, similar to example 8 above. This produces the following results:

central front surface curve ═ 9.0D (@1.4999)

Average transmitted focal power of 0.1 × 10^-2D

The generated on-axis optical cylinder is 0.1 × 10^-2D

Maximum off-axis cylindrical lens 0.2D

Wherein the constant value coefficient is

a₀＝a₁＝a₃＝a₅＝a₇＝0.0

a₂＝0.849057×10^-2

a₄＝0.610000×10^-6

a₆＝0.150000×10^-9

Example 14

Example 13 was repeated using a 9D optic zone front surface and a 7D circular back surface design to define an integral transmissive element with a transmitted power of + 2D. The front surface of the temple extension curves to 4.5D and produces a temple region with slightly positive refractive power.

The surface is defined by the modified mathematical approximation with N2 and a negative value of the parameter α (-1.2). The surface properties are given in table 7 below.

The resulting lens element is schematically depicted in fig. 21.

It is apparent that the lens element can be rotated or decentered to improve the cosmetic relationship with the wearer's face without the need for higher lens curvatures.

Example 15

Example 14 was repeated using a front surface with an optical zone of 12.00D and a back surface of 8.00D to define an integral transmissive element with a transmitted optical power of + 4.00D. The anterior surface of the temple extension curves to 4.25D.

The resulting lens element is schematically shown in fig. 22, and the surface characteristics thereof are given in table 8. In this case, the temple extension smoothly changes from the power of the optical zone (+4.00D) to the piano portion.

Example 16

Example 15 was repeated again using the anterior surface generated curve for the temporal extension of 12.00D and setting N to 1 instead of N to 2 as in the previous example of fig. 22.

The resulting lens element is schematically shown in fig. 23, and the surface characteristics thereof are given in table 9. In this case, the temporal extension is plain, and the optical zone diameter is reduced.

Example 17

Example 14 was repeated using an optical zone of 4.50D for the front surface and 8.50D for the back surface to define an integral transmissive element having a transmitted optical power of-4.00D. The anterior surface of the temple extension curves to 2.50D.

The resulting lens elements are schematically depicted in fig. 24, and the surface characteristics thereof are given in table 10. In this case, the temporal extension smoothly changes from the power of the optical zone (-4.00D) to the plano section.

Example 18

Example 17 is repeated again using the anterior surface generated curve for the temporal extension of 11.00D and setting N to 1 instead of N to 2 as in the previous example of fig. 24.

The resulting lens element is schematically shown in fig. 25, and the surface characteristics thereof are given in table 11. In this case, its temple extension is flat, the lens center is thinner, and the optical zone diameter is reduced.

Example 19

Positive lens

Example 14 was repeated using the curve generated for the anterior surface of the temporal extension of 8.00D. A tapered posterior surface of 8.0D and an anterior surface of 11.0D were used to define a lens with a power of +3.0D, which is typically a plano-temporal extension with a low edge thickness.

The resulting lens element is schematically depicted in fig. 26. The lens exhibits a discontinuity at the transition between said two design regions. The surface properties of the lens element shown in fig. 26 are given in table 12.

Example 20

Example 19 was repeated to produce a +1.0D lens with an 8.0D background temporal extension.

The resulting lens element is shown in fig. 27. The surface characteristics of the lens elements shown in fig. 27 are given by table 13.

Example 21

Example 19 was repeated to produce a-2.0D lens with an 8.0D background temporal extension.

The resulting lens elements are schematically depicted in fig. 28. The surface properties of the lens element shown in fig. 28 are given in table 14.

Example 22

An optical lens element having a peripheral temporal region is made from an anterior +11D background aspheric anterior surface and a +8D background spherical posterior surface to provide a +3D lens element.

The curvature of the temporal region of the anterior surface is modified so that it corresponds to the curvature of the posterior surface, thereby defining a plano-temporal extension.

The surface is designed using the modified mathematical formula described above. Specifically, the lens element has a spherical or toric posterior surface with a curvature selected to match the wrap-around frame. The front surface of the lens element is an aspheric surface having three distinct regions. The central prescription zone is designed to provide the required transmitted optical power and is optimized to minimize off-axis astigmatism and power errors. The front surface of the lens element at the peripheral or temple extension region is spherical and is designed so that the lens has no transmitted optical power (plano) in this region, as in over-the-counter sunglasses. The surface between the inner and outer regions is created by a polynomial spline (which aims to smoothly connect the central and peripheral regions. Although its surface is designed to rotate the full surface, only a portion of that surface is used in an actual frame. The lens shape can then be made in such a way that only a part of the full surface of rotation is produced before edging to fit into the frame.

The surface properties are given in table 15 below.

The resulting lens elements are schematically depicted in fig. 29.

Example 23

Example 22 was repeated using a 5.0D background aspheric anterior surface and an 8.0D background spherical posterior surface to define a-3D background lens element.

The surface properties are given in table 16 below.

The resulting lens elements are schematically depicted in fig. 30.

TABLE 1

Polycarbonate ASL

TABLE 2

Polycarbonate ASL

TABLE 3

Polycarbonate ASL

TABLE 4

Polycarbonate ASL

TABLE 5

Highly curved wound plano lens element

TABLE 6

Highly curved wound plano lens element

TABLE 7

TABLE 8

TABLE 9

Watch 10

TABLE 11

TABLE 12

TABLE 12 continuation

Watch 13

TABLE 14

Watch 15

Lens diameter

40.0

Front surface

Polynomial sheet (polynominal sheets) numbering

Polynomial order 3

Front surface (sheet 1)

Polynomial order 8

The coefficients of the central aspheric surface are optically optimized for r-0 to r-20.

+0.00000D+00 0

+0.00000D+00 1

+1.03280D-02 2

+0.00000D+00 3

+1.26810D-06 4

+0.00000D+00 5

+3.00100D-10 6

+0.00000D+00 7

+1.82900D-13 8

Connection radius (1-2)

20

Front surface (sheet 2)

Polynomial order 3

Polynomial simulations connecting from an inner aspheric surface to a peripheral spherical surface, acting on r-20 to r-35

-7.53462D+00 0

+8.36819D-01 1

-1.75540D-02 2

+2.72230D-4 3

Connection radius (2-3)

35

Front surface (sheet 3)

Polynomial order 8

Peripheral spherical coefficient, acting on other than r-35

+2.10000D+00 0

+0.00000D+00 1

+7.43494D-03 2

+0.00000D+00 3

+4.10992D-07 4

+0.00000D+00 5

+4.54379D-11 6

+0.0000D+00 7

+6.27934D-15 8

Thickness of center

3.1

Rear surface

Polynomial numbering

1

Rear surface (sheet 1)

Polynomial order 8

Spherical coefficient of rear surface

+310000D+00

+0.00000D+00

+7.54717D-03

+0.00000D+00

+4.29885D-07

+0.00000D+00

+4.89723D-11

+0.00000D+00

+6.97363D-15

TABLE 16

Radius of lens

40.0

Front surface

Polynomial piece numbering

Polynomial order 3

Front surface (sheet 1)

Polynomial order 8

Optically optimizing the coefficients of the central aspheric surface, acting on r-0 to r-20

+0.00000D+00

+4.52750D-03

+0.00000D+00

+1.17470D-07

+0.00000D+00

-7.92780D-11

+0.00000D+00

+1.86270D-14

Connection radius (1-2)

20

Front surface (sheet 2)

Polynomial order 3

+1.44473D+01

-1.66106D+00

+6.22643D-02

-5.38318D-04

Connection radius (2-3)

40

Front surface (sheet 3)

Polynomial order 8

+0.00000D+00

+7.43494D-03

+0.00000D+00

+4.10992D-07

+0.00000D.00

+4.54379D-11

+0.00000D+00

+6.27934D-15

Thickness of center

1

Rear surface

Polynomial piece numbering

1

Rear surface (sheet 1)

Polynomial order 8

+1.00000D+00

+0.00000D+00

+7.54717D-03

+0.00000D+00

+4.29885D-07

+0.00000D+00

+4.89723D-11

+0.00000D+00

+6.97363D-15

Finally, it is to be understood that various other adaptations and/or modifications may be made without departing from the spirit of the invention outlined herein.

Claims

1. An optical lens element comprising

Front and rear surfaces, at least one of which is continuous and forms a prescription area and a peripheral temple area for providing protection at the temple location, the areas being smoothly connected to avoid prismatic jumping from the prescription area to the temple area,

wherein the lens element is adapted to be mounted in a roll-up or shutter-type frame such that the lens can be temporarily rotated about a vertical axis passing through its optical center.

2. The optical lens element of claim 1, wherein the peripheral temporal region is an over-the-counter region.

3. An optical lens element according to claim 1, wherein the front and/or rear surface of the lens element comprises a spherical or toric portion to provide the desired prescription in the prescription area.

4. The optical lens element of claim 1, wherein the peripheral temporal region is at least partially generally toric.

5. An optical lens element according to claim 4, wherein the peripheral temporal region is at least partially generally flat.

6. An optical lens element according to claim 5, wherein the curvature of the anterior surface is modified in the peripheral temporal region to substantially correspond to the curvature of the posterior surface.

7. An optical lens element according to claim 1, wherein the lens element comprises one or more of a mirror coating, a light control coating, a reflective coating or a light control tint in the peripheral temporal region.

8. An optical lens element according to claim 1, wherein the shape of the region of the front or back surface between the two regions is derived from a polynomial spline selected to smoothly connect the two regions.

9. The optical lens element of claim 1, wherein the prescription region extends beyond 50 ° off-axis.

10. An optical lens element comprising front and rear surfaces, a prescription correction zone provided in the range of about-6.0D to +6.0D with 0 to +3 cylinder, and a peripheral temporal zone for providing protection at the temporal location, the zones being joined smoothly to avoid a prismatic jump from the prescription zone to the temporal zone,

wherein the front surface is capable of being mounted in a prescription-independent frame of constant design curve, the frame curve being 5.0D and above; and is

This posterior surface provides a good gap with the temples or eyelashes.

11. The optical lens element of claim 10, wherein the peripheral temporal region is an over-the-counter region.

12. An optical lens element according to claim 10, wherein the front surface is mountable in a frame with a constant design curve between 8.0D and 10.0D.

13. An optical lens element according to claim 10, wherein the anterior surface of the lens element has a high curve extending from the naso-nasal to temporal border but a vertical curve at 6.0D or below.

14. An optical lens element according to claim 10, wherein the shape of the front or back surface at a location between the two regions is derived from a polynomial spline selected to smoothly connect the two regions.

15. The optical lens element of claim 10, wherein the prescription region extends beyond 50 ° off-axis.

16. The optical lens element of claim 15, wherein the prescription region terminates at a peripheral temporal region.

17. A unitary lens comprising a pair of optical lens elements, each lens element having

Front and rear surfaces, at least one of which is continuous and forms a prescription area and a peripheral temple area for providing protection at the temple location, the areas being smoothly connected to avoid prismatic jumping from the prescription area to the temple area; and is

Providing a prescribed correction, in the range of about-6.00D to +6.00D, with 0 to +3 cylindrical lenses,

wherein the front surface is capable of being mounted in a frame of constant design curve independent of the prescription power, the frame curve being 5.0D and above; and is

This posterior surface provides a good gap with the temples or eyelashes.

18. The unitary lens of claim 17, wherein the peripheral temporal region is an over-the-counter region.

19. The unitary lens of claim 18, wherein the lens provides the correct prescription correction to the wearer at a prescription zone that is no greater than 50 ° off-axis.

20. The unitary lens according to claim 19, wherein the lens provides the wearer with correct prescription correction over a prescription region that is more than 50 ° off-axis, thereby providing a clear view of objects in the peripheral region of the field of view of the human eye and avoiding a prismatic jump from the prescription region to the peripheral temporal region.

21. A unitary lens according to claim 20, wherein the lens terminates in a peripheral temporal region.

22. The unitary lens of claim 19, wherein the prescription region extends up to 80 ° off-axis.

23. A unitary lens according to claim 17, wherein the shape of the anterior or posterior surface at a location between said two regions is derived from a polynomial spline selected to smoothly connect the two regions.

24. An optical lens element adapted to be mounted in a roll-up or shutter frame such that the lens element is temporarily rotated about a vertical axis passing through its optical center, the lens element comprising

Front and rear surfaces, at least one of which is continuous and forms a prescription area and a peripheral temple area for providing protection at the temple location, the areas being smoothly connected to avoid prismatic jumping from the prescription area to the temple area;

the anterior and/or posterior surfaces have a surface curvature adjusted to at least partially compensate for the mean power error and include a second surface correction comprising a toric portion that at least partially corrects for the astigmatic error and/or an aspheric portion that at least partially adjusts for off-axis astigmatism and/or the mean power error.

25. An optical lens element according to claim 24, wherein the anterior and/or posterior surfaces comprise a toric component and are provided with a surface correction to at least partially adjust for on-axis astigmatism and mean power errors.

26. An optical lens element according to claim 25, wherein the anterior and/or posterior surfaces include an aspheric component selected to at least partially adjust off-axis astigmatism and mean power error and avoid prismatic jump.

27. An optical lens element according to claim 26, wherein the anterior surface thereof is an aspheric surface having appropriate aspheric coefficients to define a peripheral temporal region.

28. The optical lens element of claim 27, wherein the aspheric anterior surface is line symmetric about its horizontal geometric axis.

29. An optical lens element according to claim 28, wherein the aspheric front surface is line symmetric about its vertical geometric axis.

30. An optical lens element according to claim 29, wherein the aspheric surface includes a horizontal correction.

31. An optical lens element according to claim 24, wherein the optical axis is decentered with respect to a geometric axis of the lens element.

32. An optical lens element according to claim 31, wherein the optical axis is horizontally decentered with respect to a geometric axis of the lens element to provide prismatic correction.

33. An optical lens element according to claim 24, wherein the lens provides the correct prescription correction to the wearer over a prescription zone no more than 50 ° off-axis.

34. An optical lens element according to claim 24, wherein the lens provides the wearer with correct prescription correction over a prescription zone that is more than 50 ° off-axis, thereby providing a clear view of objects in the peripheral region of the field of view of the human eye and avoiding a prismatic jump from the prescription zone to the peripheral temporal zone.

35. An optical lens element according to claim 34, wherein the lens terminates in a peripheral temporal region.

36. The optical lens element according to claim 24, wherein the back surface has a base curvature such that a desired prescription optical power for the patient can be achieved in the prescription zone, the back surface being further modified to compensate for the selected front surface.

37. An optical lens element according to claim 36, wherein the back surface comprises a toric or spherical portion selected to achieve the prescribed optical power and the prescribed lens cylinder correction.

38. An optical lens element according to claim 37, wherein the rear surface further comprises astigmatic error correction to compensate for lens wrap.

39. An optical lens element according to claim 38, wherein the surface is an aspheric toric surface and includes an adjustment to correct off-axis astigmatism and/or mean power error.

40. An optical lens element according to claim 39, comprising

Said anterior surface is an aspheric anterior surface having a base curvature suitable for high base curve lenses and suitable aspheric coefficients to define a peripheral temporal region; and

the back surface has an appropriate curvature to provide the prescribed optical lens power and the prescribed lens cylinder, and includes adjustments for correcting astigmatic and mean power errors to compensate for lens wrap-around.

41. An optical lens element according to claim 24, wherein the rear surface comprises a toric or spherical portion.

42. The optical lens element of claim 24 wherein

The anterior surface having a spherical or toric portion designed to provide the desired prescription in the prescription zone and with surface correction to at least partially accommodate errors including astigmatism error and mean power error with the posterior surface,

and with appropriate coefficients to define the peripheral temporal region; and is designed to smoothly connect the transition between the prescription region and the peripheral temporal region,

the rear surface is modified to compensate for the front surface.

43. An optical lens element adapted to be mounted in a roll-up or shutter frame, the lens element comprising:

front and rear surfaces, at least one of which is continuous, capable of forming a prescription area and a peripheral temple area for providing protection at the temple location, the areas being smoothly connected to avoid prismatic jumping from the prescription area to the temple area,

wherein its optical axis is decentered with respect to the geometric axis of the lens element,

44. An optical lens element according to claim 43, wherein the optical axis is horizontally decentered with respect to a geometric axis of the lens element to provide prismatic correction.

45. The optical lens element of claim 43, wherein the peripheral temporal region is an over-the-counter region. .

46. An optical lens element according to claim 43, wherein the lens element is temporarily rotated about a vertical axis passing through its optical center.

47. An optical lens element according to claim 46, wherein the front and/or back surfaces further have surface corrections to at least partially adjust for off-axis astigmatism and mean power errors and to avoid prismatic jump.

48. A laminated optical product suitable for mounting in a roll-up or shutter frame, comprising

A front lens element;

a compensated rear lens element; and

an internal adhesive interface between the front lens element and the rear lens element,

wherein the front outer surface corresponds to the front surface of the front lens element; the rear exterior surface corresponds to the rear surface of the rear lens element,

wherein the anterior and/or lens element includes a prescription region and a peripheral temple region for providing protection at the temple location, the regions being smoothly connected to avoid prismatic jumps from the prescription region to the temple region, and,

wherein at least one of the anterior and posterior exterior surfaces has a surface curvature adjusted to at least partially compensate for the mean power error and includes a second surface correction comprising a toric portion at least partially correcting the astigmatic error and/or an aspheric portion at least partially adjusting the off-axis astigmatism and/or the mean power error.

49. The laminated optical product of claim 48, wherein the peripheral temporal region is an over-the-counter region.

50. The laminated optical product of claim 48, wherein the laminated product is temporarily rotated about a vertical axis through its optical center, or its optical axis is made eccentric with respect to a geometric axis, or the lens element is both rotated and decentered.

51. A laminated optical product as in claim 50, wherein the optical axis is horizontally decentered with respect to a geometric axis of the lens element to provide prismatic correction.

52. A laminated optical product adapted to be mounted in a roll-up or apron frame such that the laminated product can be temporarily rotated about a vertical axis passing through its optical center, the laminated optical product comprising

A front lens element;

a compensated rear lens element; and

53. The laminated optical product of claim 52, wherein

The front lens element is a generally plano lens; and is

The compensated rear lens element comprises a lens element of positive or negative optical power.

54. A method of manufacturing an optical lens element adapted to be mounted in a roll-up or shutter frame, the method comprising

Providing a mathematical or numerical expression having a front or rear surface height of an optical lens element designed to provide a portion of a desired prescription in a prescription region;

adding a mathematical or numerical expression of a peripheral temporal region to the mathematical or numerical expression of the anterior or posterior lens surface to define a complete lens surface;

adding a second mathematical or numerical expression of a transition zone designed to smoothly blend the prescription zone and the peripheral temporal zone;

modifying the expression for the lens surface to have a surface curvature adjusted to at least partially compensate for the average power error and to include a second surface correction comprising a toric portion to at least partially correct for the astigmatic error and/or an aspheric portion to at least partially adjust the off-axis astigmatism and/or the average power error; and is

The lens surface representation is rotated and/or decentered with respect to a vertical axis passing through the optical center of the lens surface to enable the lens element to be mounted in a roll-up or shutter frame.

55. The method of claim 54, further comprising providing a mathematical or numerical expression of the prescription back surface after modifying the expression.

56. The method of claim 54, wherein the surface of the optical lens element is represented by

sag＝SAG R≤R₀，

Wherein sag is A₂R²+A₄R⁴+A₆R⁶+A₈R⁸And R is the radius measured from the optical axis, and A₂，A₄，A₆And A₈Coefficients defining the optical power and the asphericity;

sag＝SAG+DSAG R≥R₀

wherein R is₀An outer edge defining a temple region; and is

DSAG＝B₂(R-R₀)²+B₄(R-R₀)⁴+B₆(R-R₀)⁶+B₈(R-R₀)⁸

57. A method according to claim 56, wherein the surface is represented by

sag＝SAG+α(DSAG)^NFor R ≧ R₀，

Wherein alpha and N ≧ 1 are numerical parameters.

58. The lens element of claim 1, modified to enhance the shape of the nasal region and including a region of reduced or opposite curvature to define a nasal enhancement region.

59. The lens element of claim 1, wherein the lens element is an ophthalmic lens.

60. An ophthalmic lens adapted to be mounted in a roll-up or fender frame such that a lens element is temporarily rotated about a vertical axis passing through its optical center, the lens element comprising

61. An ophthalmic lens adapted to be mounted in a roll-up or fender frame, the lens element comprising

wherein the optical axis thereof is decentered with respect to the geometric axis of the lens element to provide prismatic correction,

62. The ophthalmic lens of claim 61, wherein the optical axis is horizontally decentered with respect to a geometric axis of the lens element to provide prismatic correction.

63. The ophthalmic lens of claim 62, wherein the lens provides correct prescription correction to the wearer over a prescription zone that is no greater than 50 ° off-axis.

64. The ophthalmic lens of claim 62, wherein the lens provides the wearer with correct prescription correction over a prescription area that is more than 50 ° off-axis, thereby providing clear viewing of objects in a peripheral area of the field of view of the human eye and avoiding prismatic jump from the prescription area to the peripheral temporal area.

65. The ophthalmic lens of claim 64, wherein the lens terminates in a peripheral temporal region.

66. The ophthalmic lens of claim 62, wherein the back surface has a base curvature such that a desired prescription power, prescription for the patient can be achieved in the prescription zone; the back surface is further modified to compensate for the selected front surface.

67. An eyeglass comprises

A roll-up spectacle frame for carrying a pair of ophthalmic lenses such that each lens can be temporarily rotated about a vertical axis passing through its optical center; and

a pair of ophthalmic lenses, each lens comprising

An anterior and posterior surface that together form a prescription area and a peripheral temple area for providing protection at the temple location, the areas being smoothly connected to avoid prismatic jumping from the prescription area to the temple area;

68. The eyewear of claim 67, wherein the peripheral temple region is an over-the-counter region.

69. The eyewear of claim 67, wherein the optical axis is decentered with respect to the geometric axis of the lens elements.

70. An eyewear according to claim 69, wherein the optical axis is horizontally decentered with respect to the geometric axis of the lens element to provide prismatic correction.

71. The ophthalmic lens of claim 70, wherein the lens provides correct prescription correction to the wearer in a prescription zone that is no more than 50 ° off-axis relative to the optical axis.

72. An ophthalmic lens according to claim 71, wherein the lens provides correct prescription correction to the wearer over a prescription area that is more than 50 ° off-axis, thereby providing clear vision of objects in the peripheral region of the field of vision of the human eye and avoiding prismatic jump from the prescription area to the peripheral temporal area.

73. The ophthalmic lens of claim 72, wherein the lens terminates in a peripheral temporal region.