JPH11167088A - Contact lens storage container - Google Patents

Abstract

(57) [Problem] To provide a contact lens storage container capable of measuring an optical characteristic value of a contact lens in a state sealed in a case. SOLUTION: The contact lens storage container of the present invention comprises:
The contact lens 5 is stored in the case 1 in a state where the contact lens 5 is immersed in the storage solution 4. The case 1 has a flat shape in the thickness direction of the contact lens 5.
The first wall 6 and the other wall 7 in the thickness direction of the case 1 are made transparent so that light can pass therethrough, and can be used to measure the optical characteristic value of the contact lens 5.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a contact lens storage container for storing contact lenses in a case in a state where the contact lenses are immersed in a preservative solution. The present invention relates to a contact lens storage container that can be used for measuring an optical property value.

[0002]

2. Description of the Related Art Heretofore, there has been known a contact lens storage container for storing a contact lens in a case in a state of being immersed in a storage solution. This conventional contact lens storage container has a cap lid sealed so that the contact lens can be opened and the contact lens can be taken out of the case. The contact lens storage container describes the optical characteristic values of the enclosed contact lens.
The manufacturer of the contact lens measures in advance a lens meter before enclosing the contact lens in order to write the optical property value in the contact lens storage container.

[0003]

By the way, it may be doubtful whether the optical characteristic value of the contact lens described in the contact lens storage container is always accurate or not. There is a demand for measuring the optical characteristic value of a contact lens enclosed in the contact lens storage container for the purpose of reconfirmation before sale.

However, the conventional contact lens storage container cannot measure the optical characteristic value of the contact lens in a state where the contact lens is enclosed in the case, and thus the optical characteristic value of the contact lens cannot be measured. When measuring, the cap lid must be removed from the case and opened, and the contact lens must be taken out of the storage container for the contact lens and set on the lens meter. Since it cannot be resealed from the viewpoint, a contact lens storage container capable of measuring the optical characteristic value of the contact lens in a state of being sealed in a case is desired.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a contact lens storage container capable of measuring an optical characteristic value of a contact lens in a state sealed in a case. Is to do.

[0006]

A contact lens storage container according to claim 1 of the present invention stores a contact lens in a case in which the contact lens is immersed in a storage solution, and the case has a thickness of the contact lens. It is a flat shape in the direction,
The thickness direction one surface wall and the other surface wall of the case are transparent so that the measurement light beam of the lens meter can be transmitted, and the case can be used to measure the optical characteristic value of the contact lens. I do.

A contact lens storage container according to claim 2 of the present invention, wherein one of the one surface wall and the other surface wall of the case projects from one side to the other and supports the contact lens. And the support portion defines a predetermined position on the back surface of the contact lens when the optical property value is measured by setting the case on the lens meter.

[0008]

FIG. 1 is a perspective view of a contact lens storage container. In FIG. 1, reference numeral 1 denotes a case, and 2 denotes a rubber cap lid. The cap lid 2 is sealed by a seal belt 3 made of aluminum. As shown in FIGS. 2 and 3, a physiological saline solution 4 as a preservation solution is contained in the case 1, and a soft contact lens 5, for example, is immersed in the physiological saline solution 4 to maintain the wetness. ing. Note that reference numeral 4 'indicates a bubble.

The case 1 is a soft contact lens 5
In the thickness direction, the one wall 6 and the other wall 7 in the thickness direction of one case are transparent in order to transmit a measurement light beam of a lens meter described later.

The case 1 has a bottom portion on the far side from the cap lid 2 and a positioning portion 8 for positioning the soft contact lens 5 when measuring the optical characteristic value of the soft contact lens 5 is provided on the bottom portion. ing. The positioning section 8 is composed of a pair of inclined walls 10 and 11 that abut on the outer peripheral edge 9 of the soft contact lens 5.

The positioning portion 8 is provided with a cylindrical support portion 12 which projects from the one wall 6 to the other wall 7 and supports the soft contact lens 5 on the one wall 6 of the case 1. I have. When the case 1 is set on the lens meter and its optical characteristic value is measured, the support portion 12 is located at the vertex position 13 on the back surface of the soft contact lens 5.
Plays a role in defining a height from a lens receiving table (described later).

When the soft contact lens 5 is not supported by the support portion 12 when the optical characteristic value of the soft contact lens 5 is measured by the lens meter, FIG.
As shown in (1), the case 1 is picked up and shaken appropriately, and the soft contact lens 5 is floated and swung in the physiological saline solution 4 so that the soft contact lens 5 is placed on the support portion 12.

In FIG. 4, reference numeral 14 denotes a lens meter. The lens meter 14 is provided with an abutting member 15 for abutting a contact lens storage container shown in FIG. desirable. The abutment member 15 has a positioning recess 15 a and a contact reference surface 15 b having a shape corresponding to the shape of the bottom of the case 1.
When the case 1 is set on the lens meter 14 and the optical characteristic value of the soft contact lens 5 is measured, the butting member 15 is set on the lens receiving table 16.
At this time, the abutment member 15 is brought into contact with the contact reference surface 15b.
Is applied to the frame pad 17.

In FIG. 4, 18 is a monitor, 19 is a display screen, 20 is an upper optical component storage unit,
1 is a lower optical component housing, 22 is a lens receiving cylinder, 23 'is a measurement mode switch in a case, 23 is a normal mode measurement switch. When the contact lens storage container is set on the lens receiving table 16, The lens receiving cylinder 22 is removed.

The upper optical component storage section 20 and the lower optical component storage section 21 constitute a measuring optical system shown in FIG. 6. In FIG. 6, reference numeral 24 denotes light projecting means, and 25 denotes light receiving means. Here, the light projecting unit 24 is stored in the upper optical component storage unit 20, and the light receiving unit 25 is stored in the lower optical component storage unit 21.

The light projecting means 24 is a light source 2 for generating a measurement light beam.
6, a pinhole plate 27, a collimating lens 28, and a reflection mirror 29, and reference numeral 27a is a pinhole. The light receiving means 25 includes a screen 30 and a CCD camera 31. The pinhole plate 27 is disposed at the focal position of the collimator lens 28, and the light beam emitted from the light source 26 is converted into a parallel light beam P. The screen 30 is composed of a diffusion plate. The CCD camera 31 includes an imaging lens 32 and an image sensor 33
It consists of

The lens receiving table 16 has a rectangular shape as shown in FIG. 7, and a pattern 34 is formed substantially at the center thereof. The pattern 34 includes four rectangular slit holes 34a to 34d, and has a square shape as a whole, and the edges of the slit holes 34a to 34d are separated. In FIG. 7, the shaded portion is the light shielding portion 34e.

When the lens is not set in the optical path of the measurement light beam, the parallel light beam P
4A to 34D, a pattern image 35 having the same size as the slit holes 34A to 34D is formed on the screen 30 as shown in FIG. When the contact lens storage container is set on the lens receiving table 16, since the contact lens has a negative power,
The parallel light flux P is diffused by the lens action, and a pattern image 35 having a wide slit interval is formed on the screen 30 as shown in FIG. When a lens having positive power is set on the lens receiving table 16,
As shown in FIG. 10, a pattern image 35 with a narrow slit interval is formed on the screen 30.

The image sensor 33 is connected to a processing circuit 36,
The processing circuit 36 calculates an optical characteristic value by a known method. A micro switch 37 is provided on the lens receiving table 16, and the micro switch 37 is
It is determined whether or not the abutting member 15 is set on the lens receiving table 16 by turning on and off the monitor 8, and the monitor 18 enters the CL case mode. When the contact lens storage container is set on the lens receiving table 16, the processing circuit 36 executes a measurement value conversion program described below.

That is, the measured value obtained when the soft contact lens 5 is immersed in the contact lens storage container is then converted into the measured value of the soft contact lens 5 measured in air.

The refractive power S ₀ of the contact lens in air.
Is determined by the following equation, assuming that the thickness of the contact lens is extremely small.

S ₀ = 1 / f ₀ = (n−1) (1 / r ₁ −1 / r ₂ ) (1) In the above equation, f ₀ is the focal length of the contact lens in the air, n Is the refractive index of the contact lens material,
r ₁ and r ₂ are the radii of curvature of each surface of the contact lens. On the other hand, the refractive power S _w in a state of immersing the contact lens in the liquid is determined by the following equation.

S _w = 1 / f _w = {(n−n _w ) / n _w } (1 / r ₁ −1 / r ₂ ) (2) In the above equation, f _w represents the contact lens in a liquid. The immersion focal length, n _w, is the refractive index of the liquid.

Here, the measurement light beam P penetrates the contact lens storage container and reaches the light receiving means 25 via the air, and the thickness of the liquid layer in the case 1, the one surface wall 6 of the case 1, and the other surface wall 7 is increased. Is assumed to be negligibly small, the above equation (2) can be approximated to the following equation (3).

S _v = 1 / f _v = 1 / (n _w · f _w ) (3) where S _v is the apparent refractive power and f _v is the apparent focal length.

[0026] That is, different refractive power S ₀ of the refractive power of the apparent S _v in the air in a state of being immersed in the liquid. Therefore, the apparent refractive power S _v is changed to the refractive power S _{0 in} air.
Is converted based on the following equation (4).

S ₀ = (n−1) {(S _v · n _w ) / (n−n _w )} (4) The refractive index n _{w of the} liquid and the refractive index n of the material of the contact lens
Is known, the apparent refractive power S _v can be converted to the refractive power S ₀ in air.

The measured refractive power S ₀ , the cylindrical power C obtained by the calculation, and the cylindrical axis A are displayed on the display screen 19 of the monitor 18.

For a conversion method even when the refractive index is unknown, refer to Japanese Patent Application No. 8-98117.

In the embodiment of the present invention, the case where the case 1 is set on the upright lens meter 14 to measure the contact lens has been described, but as shown in FIG. The contact lens can be measured by setting the case 1 to a telescope type lens meter 40.

In FIG. 11, reference numeral 41 denotes a base member, and reference numeral 42 denotes a measuring unit. The base member 41 is provided with a pair of support brackets 43 constituting a part of the lifting mechanism 39, and the pair of support brackets 43 is fixed with a rotation shaft 44 laid over the pair of support brackets 43. 4
2a is rotatably supported. A torsion coil spring 45 is wound around the rotation shaft 44, one end 45 a of the torsion coil spring 45 abuts on the engagement piece 46 of the measuring section 42, and the other end 45 b abuts on the base member 41, and the torsion coil spring 45 Urges the measurement unit 42 in the upright direction (the direction of the arrow X) with the rotation shaft 44 as a fulcrum. The measurement unit 42 urges the torsion coil spring 45 in the upright direction and the tilting force of the measurement unit 42 due to its own weight. It is stationary at the point where is balanced.

When the case 1 is set on the lens meter 40, the lens receiving cylinder 42b is removed, the measuring section 42 is raised, and the measuring section 42 is set upright with respect to the base member 41.
The measurement is performed with the case 1 placed on the lens receiving table 42c. Even if the measuring part 42 is inadvertently tilted after the measurement, the measuring part 42 is prevented from colliding with the base member 41 due to the urging force of the torsion coil spring 45 in the rising direction, thereby preventing damage or injury due to carelessness. it can. Reference numeral 42d is a lens holder.

The lifting mechanism 39 need not be limited to the one having the structure shown in FIG. 11. For example, instead of the torsion coil spring 45, as shown in FIG.
1, a V-shaped leaf spring 47 may be provided to bias the measuring unit 42 in the upright direction. In addition, as shown in FIG.
The balance weight 48 may be provided to bias the measurement unit 42 in the upright direction. Further, as shown in FIG. 14, the lifting mechanism 39 may be configured by the gear mechanism 48. If the gear mechanism 48 has a heavy rotation, the measuring section 42 can be prevented from suddenly colliding with the base member 41.

[0034]

As described above, according to the present invention, a contact lens storage container capable of measuring the optical characteristic value of a contact lens in a state sealed in a case can be provided.

[Brief description of the drawings]

FIG. 1 is a perspective view of a contact lens storage container according to the present invention.

FIG. 2 is a horizontal sectional view of the contact lens storage container shown in FIG.

FIG. 3 is a vertical sectional view of the contact lens storage container shown in FIG.

FIG. 4 is a perspective view of a lens meter in which the contact lens storage container shown in FIG. 1 is set.

FIG. 5 is a plan view of a contact lens abutting member.

6 is an optical system diagram of the lens meter shown in FIG.

7 is a plan view of the lens receiving table shown in FIG.

FIG. 8 is an explanatory diagram of a pattern image projected on a screen when a lens is not set in a light projection optical path when the lens is not set.

FIG. 9 is an explanatory diagram of a pattern image projected on a screen when a contact lens storage container is set in a light projection optical path.

FIG. 10 is an explanatory diagram of a pattern image projected on a screen when a lens having a positive power is set in a light projection optical path.

FIG. 11 is an explanatory diagram of a case where a contact lens storage container is set in a telescopic lens meter having a dropping mechanism, and is a side view of a lensmeter in which a torsion coil spring is used in the dropping mechanism.

FIG. 12 is a side view of a modification of the telescopic lens meter drop mechanism, in which a leaf spring is used for the drop mechanism.

FIG. 13 is a view showing a modified example of the tilting mechanism of the telescope type lens meter, and is a side view of the lens meter in which a balance weight is used for the tilting mechanism.

FIG. 14 is a view showing a modified example of a telescopic lens meter drop mechanism, and is a side view of a lens meter in which a gear mechanism is used as the drop mechanism.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Case 4 ... Preservation liquid 5 ... Soft contact lens 6 ... One wall 7 ... Other wall P ... Measurement light flux

Claims (2)

[Claims] 1. A method for storing a contact lens in a case in a state where the contact lens is immersed in a preservative solution, wherein the case has a flat shape in a thickness direction of the contact lens, and the case allows the measurement light flux of a lens meter to be transmitted. A contact lens storage container in which a first wall and a second wall in a thickness direction of a case are transparent, and can be used for measuring an optical characteristic value of the contact lens. 2. One of the one surface wall and the other surface wall of the case is provided with a supporting portion projecting from one side to the other and supporting the contact lens, and the supporting portion is provided on the lens meter. The contact lens storage container according to claim 1, wherein a predetermined position on the back surface of the contact lens is defined when the case is set and the optical characteristic value is measured.