CN108957789B - Eyeglass lens and therapeutic device for preventing asymmetric visual field from causing refractive deterioration and visual fatigue - Google Patents
Eyeglass lens and therapeutic device for preventing asymmetric visual field from causing refractive deterioration and visual fatigue Download PDFInfo
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- CN108957789B CN108957789B CN201811140897.2A CN201811140897A CN108957789B CN 108957789 B CN108957789 B CN 108957789B CN 201811140897 A CN201811140897 A CN 201811140897A CN 108957789 B CN108957789 B CN 108957789B
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- G—PHYSICS
- G02—OPTICS
- G02C—SPECTACLES; SUNGLASSES OR GOGGLES INSOFAR AS THEY HAVE THE SAME FEATURES AS SPECTACLES; CONTACT LENSES
- G02C7/00—Optical parts
- G02C7/02—Lenses; Lens systems ; Methods of designing lenses
- G02C7/06—Lenses; Lens systems ; Methods of designing lenses bifocal; multifocal ; progressive
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- G—PHYSICS
- G02—OPTICS
- G02C—SPECTACLES; SUNGLASSES OR GOGGLES INSOFAR AS THEY HAVE THE SAME FEATURES AS SPECTACLES; CONTACT LENSES
- G02C7/00—Optical parts
- G02C7/02—Lenses; Lens systems ; Methods of designing lenses
- G02C7/024—Methods of designing ophthalmic lenses
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- G—PHYSICS
- G02—OPTICS
- G02C—SPECTACLES; SUNGLASSES OR GOGGLES INSOFAR AS THEY HAVE THE SAME FEATURES AS SPECTACLES; CONTACT LENSES
- G02C7/00—Optical parts
- G02C7/02—Lenses; Lens systems ; Methods of designing lenses
- G02C7/04—Contact lenses for the eyes
- G02C7/041—Contact lenses for the eyes bifocal; multifocal
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Abstract
本发明提供了一种防止视野不对称导致屈光恶化和视疲劳的眼镜片及治疗仪，属于用于眼睛保健和治疗的眼镜片及治疗仪技术领域。其视区位于眼镜片中央偏上，视区的几何中心或理论几何中心到周边视区下边沿的水平线距离大于视区的几何中心或理论几何中心到周边视区的上边沿的水平线距离；周边视区上设有离焦镜片；视区为孔或设有非离焦矫正镜片，非离焦矫正镜片包括近视非离焦矫正镜片或远视非离焦矫正镜片，还有散光非离焦矫正镜片；周边视区上还复合有与上述散光非离焦矫正镜片散光度相同或基本相同的散光镜度。本发明能有效防止因眼球不对称恶化导致疲劳和屈光不正恶化，效果较好。
The present invention provides a spectacle lens and therapeutic device for preventing asymmetric visual field from causing refractive deterioration and visual fatigue, and belongs to the technical field of spectacle lenses and therapeutic devices for eye care and treatment. Its visual area is located above the center of the spectacle lens, and the horizontal line distance from the geometric center or theoretical geometric center of the visual area to the lower edge of the peripheral visual area is greater than the horizontal line distance from the geometric center or theoretical geometric center of the visual area to the upper edge of the peripheral visual area; a defocus lens is provided on the peripheral visual area; the visual area is a hole or provided with a non-defocus corrective lens, and the non-defocus corrective lens includes a myopia non-defocus corrective lens or a hyperopia non-defocus corrective lens, and an astigmatism non-defocus corrective lens; the peripheral visual area is also compounded with an astigmatism lens with the same or substantially the same astigmatism as the above-mentioned astigmatism non-defocus corrective lens. The present invention can effectively prevent fatigue and refractive error from worsening due to worsening eyeball asymmetry, and has a good effect.
Description
Technical Field
The invention belongs to the technical field of spectacle lenses and therapeutic instruments for eye health care and treatment.
Background
The prior art myopia prevention and control glasses lens is generally designed according to the fact that near objects in the peripheral area of the visual field are completely symmetrical up and down, but in reality, near objects in the peripheral area of the external visual field are not very symmetrical up and down, so that the design of the myopia prevention and control glasses lens is not in line with the actual situation. When reading and writing, the near zone part can cause serious deterioration of refractive power and asthenopia of eyes due to long-term asymmetry of the far and near upper and lower parts of the visual field outside the eyes, thereby further exacerbating further deterioration of hyperopia, myopia and astigmatism. The deterioration caused by the correction is unresolved by the prior art, and the correction of the refractive error is generally under-corrected in the prior art and the actual lens prescription, for example, the current textbook and a plurality of authoritative ophthalmic tool instructions, opthalmic books and the like all require that the lens prescription is under-corrected by some degrees, which is not under-corrected, but under-corrected, and the myopic eye is still defined as the reason for thickening of the crystalline lens caused by near accommodation, and the under-correction is mistakenly considered to prevent the crystalline lens from thickening. The prescription is required to correct myopia by less than some degree, which is not true correction, but defocus (the lack of correction produces a near defocus in the central zone of the retina). My studies found that this is responsible for accommodative asthenopia while at the same time being detrimental to controlling the deterioration of diopters. In addition, the prior art does not take into account the correction of astigmatism in the peripheral vision zone, which can also lead to refractive deterioration and asthenopia. Thus, the prior art does not control well the progression of deterioration of hyperopia, myopia and astigmatism and effectively solves the problem of asthenopia resulting therefrom.
Disclosure of Invention
The invention aims to provide an ophthalmic lens and a therapeutic apparatus for preventing the deterioration of refractive power and the asthenopia caused by the dissymmetry of visual field, which can solve the defects existing in the prior art and effectively prevent and treat the problems of refractive deterioration and the asthenopia caused by the dissymmetry of the upper and lower distances of near objects in the peripheral area of the visual field, and have good effect.
In order to solve the problems, the main technical scheme of the invention is that an eyeglass lens for preventing refractive deterioration and visual fatigue caused by visual field asymmetry is provided with a visual area S1 and a peripheral visual area S2, and the eyeglass lens is characterized in that the visual area S1 is positioned on the central deflection of the eyeglass lens, the horizontal line distance from the geometric center or the theoretical geometric center of the visual area S1 to the lower edge of the peripheral visual area S2 is larger than the horizontal line distance from the geometric center or the theoretical geometric center of the visual area S1 to the upper edge of the peripheral visual area S2, the peripheral visual area S2 is provided with a defocus lens, the 5DS > defocus lens diopter is more than 0.25DS, the visual area S1 is a hole or is provided with a non-defocus correction lens for myopia or hyperopia, the non-defocus correction lens is included, the peripheral visual area S2 is also compounded with the same or basically the same (namely basically the same refers to that the difference of 20% of the two is not more than the former), and the square area S1 <700 mm.
The geometric center refers to the center of a regular geometric shape, and the theoretical geometric center refers to the intersection point of a parallel line of the midpoint of the distance between two horizontal lines of the upper and lower outermost edges of the irregular geometric shape and a vertical line of the midpoint of the distance between two vertical lines of the left and right outermost edges.
Preferably, the total lens area is >900 square millimeters.
Preferably, the distance from the geometric center or theoretical geometric center of the viewing area S1 to the horizontal line of the lower edge of the peripheral viewing area S2 is greater than or equal to 1mm from the geometric center or theoretical geometric center of the viewing area S1 to the horizontal line of the upper edge of the peripheral viewing area S2.
Preferably, the distance from the geometric center or theoretical geometric center of the view region S1 to the lower edge horizontal line of the peripheral view region S2 is greater than the distance from the geometric center or theoretical geometric center of the view region S1 to the upper edge horizontal line of the peripheral view region S2 by 3-40 mm.
Preferably, the distance from the geometric center or theoretical geometric center of the view region S1 to the horizontal line of the lower edge of the peripheral view region S2 is greater than the distance from the horizontal line of the geometric center of the view region S1 to the horizontal line of the upper edge of the peripheral view region S2 by 4-24 mm.
Preferably, the distance from the geometric center or theoretical geometric center of the view region S1 to the lower edge of the peripheral view region S2 is greater than the distance from the geometric center or theoretical geometric center of the view region S1 to the upper edge horizontal line of the peripheral view region S2 by 6-14 mm.
Preferably, the viewing zone S1 is circular, has a diameter of 5-25mm and a diameter of 10-20mm.
The glasses for preventing the visual field asymmetry from causing the refraction deterioration and the visual fatigue are characterized by comprising the glasses lens for preventing the visual field asymmetry from causing the refraction deterioration and the visual fatigue, wherein the glasses are common frame-type glasses or clip-type hanging glasses.
A pair of glasses for preventing refractive deterioration and asthenopia due to visual field asymmetry, comprising the glasses for preventing refractive deterioration and asthenopia of eyes due to visual field asymmetry as described in the above item 1 or 2, wherein the glasses are contact lenses.
A therapeutic apparatus for preventing refractive deterioration and asthenopia caused by visual field asymmetry, comprising an ophthalmic lens for preventing refractive deterioration and asthenopia caused by visual field asymmetry as described in any one of the above, the therapeutic apparatus comprising a desk-top read-write mirror, a read-write control instrument, and a control instrument mounted on a desk.
The principle of the invention is that according to the research of defocusing animal experiments, 48 pages 8 to 12 lines in Xu Andi (teenager myopia prevention) are research defocusing experimental analysis and the experimental observation of the Beijing university medical department Zhu Xiaosong, the eye cover with different shapes can selectively cover partial retina to enlarge the symmetrical sclera, so that the eyeball shape is asymmetric and partial myopia is formed. This confirms that the response to form deprivation myopia is local to the eyeball, primarily through the retina to regulate scleral growth. The inventor carries out similar experiments, negates the misunderstanding of form deprivation in the original experiments, and obtains new important results. The study of the inventor finds that the eye shield in our experiment is an object which is in the super-near position in front of eyes, and the optical imaging of the eye shield falls on the corresponding retina to generate optical defocus at the retina, so that abnormal changes of sclera at the retina are caused, and the situation that the optical defocus at different parts of the retina affects the morphology of the part is indicated. Therefore, in order to prevent such a situation, the design of the defocus lens should be performed in accordance with the needs of the specific situation of the field of view, so that the shape of the field of view must be considered, the size of the area and defocus of the defocus lens should be designed in accordance with the design, and the problem of abnormal diopter deterioration such as asymmetry of the eyeball shape due to asymmetric bad defocus can be prevented by the correct design.
Further, the present inventors have studied and counted further, and found that the central visual field corresponds to a near object when looking near, and the upper and lower peripheral visual fields correspond to objects in the visual field at different distances, and generally the upper area corresponds to a bright distant object and the lower area corresponds to a relatively dim near object, so that the conditions are greatly different, i.e., the upper and lower visual field states are asymmetric. In order to solve the myopia problem caused by near vision, an asymmetric upper and lower vision zone structure must be designed on the lens, so that a central vision must be designed at the position of the center of the lens, so that the central vision is relatively bright, interference is avoided, and the lens cannot be positioned at the position of the center or the position of the center. Thus increasing the near-sightedness defocus range of the lower zone and reducing near-sightedness defocus disturbance of the upper zone. Thereby effectively solving the problems existing in the prior art.
The invention has the beneficial effects of solving the defects in the prior art, effectively preventing and treating the problems of eye refraction deterioration and asthenopia caused by the up-down far-near asymmetry of near objects in the peripheral area of the visual field, and having good effect.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the embodiments or the description of the prior art will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic view of the structure of an ophthalmic lens according to embodiment 1 of the present invention.
Fig. 2 is a schematic diagram of the shape and principle of the right eye vision of an actual person and a schematic diagram of the theoretical geometric center of the vision zone.
Fig. 3 is a schematic structural diagram of a pair of glasses with a common frame according to embodiment 2 of the present invention.
Fig. 4 is a schematic view of the structure of a contact lens according to embodiment 3 of the present invention.
Fig. 5 is a schematic structural diagram of a desk-top read-write mirror according to embodiment 4 of the present invention.
The reference numerals in the figure comprise an S1-visual area, an S2-peripheral visual area, an A-sphere power, a B-sphere power, a C-cylinder power, an a-mirror frame, a B-movable cross bar, a C-lifting upright post, a d-unobstructed support, an e-bottom plate, an o-theoretical geometric center, a horizontal line distance from the geometric center or theoretical geometric center of the L1-visual area S1 to the lower edge of the peripheral visual area S2, and a horizontal line distance from the geometric center or theoretical geometric center of the L2-visual area S1 to the upper edge of the peripheral visual area S2, wherein H-is L1-L2.
Detailed Description
In order to make the technical problems, technical schemes and beneficial effects to be solved more clear, the invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
Referring to fig. 1 together, the present invention will now be described. The invention provides an ophthalmic lens for preventing refractive deterioration and visual fatigue caused by visual field asymmetry, which is provided with a visual area S1 and a peripheral visual area S2, and is characterized in that the visual area S1 is positioned on the central deflection of the ophthalmic lens, the horizontal line distance from the geometric center or the theoretical geometric center of the visual area S1 to the lower edge of the peripheral visual area S2 is larger than the horizontal line distance from the geometric center or the theoretical geometric center of the visual area S1 to the upper edge of the peripheral visual area S2, the peripheral visual area S2 is provided with an out-of-focus lens, the diopter of the 5DS > out-of-focus lens is more than 0.25DS, the visual area S1 is an aperture or is provided with a non-out-of-focus correction lens, including a near-sightedness non-out-of-focus correction lens or a far-sightedness non-out-focus correction lens, and the astigmatic non-out-of-focus correction lens is further compounded on the peripheral visual area S2, and the astigmatic non-out-focus correction lens is identical or basically identical to the astigmatic non-out-focus correction lens, and the area S1 is less than 700 square mm.
The invention can solve the defects in the prior art, and can effectively prevent and treat the problems of eye refraction deterioration and asthenopia caused by the up-down far-near asymmetry of near objects in the peripheral area of the visual field.
As a specific embodiment of the present invention. See fig. 1. Preferably, the total lens area is >900 square millimeters. The effect of preventing the refraction deterioration and the asthenopia caused by the dissymmetry of the visual field is better.
As a specific embodiment of the present invention. The lens for preventing the vision asymmetry from causing the refraction deterioration and the asthenopia has the astigmatism degree of other than 0 degree. The myopia range is-25 DS-0DS, the hyperopia range is 0DS-10DS, and the astigmatism range is-8 DC.
As a specific embodiment of the present invention. See fig. 1. Preferably, the distance from the geometric center or theoretical geometric center of the viewing area S1 to the horizontal line of the lower edge of the peripheral viewing area S2 is greater than or equal to 1mm from the geometric center or theoretical geometric center of the viewing area S1 to the horizontal line of the upper edge of the peripheral viewing area S2.
As a specific embodiment of the present invention. Preferably, the distance from the geometric center or theoretical geometric center of the view region S1 to the lower edge horizontal line of the peripheral view region S2 is greater than the distance from the geometric center or theoretical geometric center of the view region S1 to the upper edge horizontal line of the peripheral view region S2 by 3-40 mm. The effect of preventing the refraction deterioration and the asthenopia caused by the dissymmetry of the visual field is better.
As a specific embodiment of the present invention. Preferably, the distance from the geometric center or theoretical geometric center of the view region S1 to the horizontal line of the lower edge of the peripheral view region S2 is greater than the distance from the horizontal line of the geometric center of the view region S1 to the horizontal line of the upper edge of the peripheral view region S2 by 4-24 mm. The effect of preventing the refraction deterioration and the asthenopia caused by the dissymmetry of the visual field is better.
As a specific embodiment of the present invention. Preferably, the distance from the geometric center or theoretical geometric center of the view region S1 to the lower edge of the peripheral view region S2 is greater than the distance from the geometric center or theoretical geometric center of the view region S1 to the upper edge horizontal line of the peripheral view region S2 by 6-14 mm. The best effect is to prevent refractive deterioration and asthenopia caused by visual field asymmetry.
As a specific embodiment of the present invention. See fig. 1. Preferably, the viewing zone S1 is circular and has a diameter of 5-25mm, preferably 10-20mm. The effect of preventing the refraction deterioration and the asthenopia caused by the dissymmetry of the visual field is better.
As a specific embodiment of the present invention. See fig. 3. The glasses for preventing the visual field asymmetry from causing the refraction deterioration and the visual fatigue are characterized by comprising the glasses lens for preventing the visual field asymmetry from causing the refraction deterioration and the visual fatigue, wherein the glasses are common frame-type glasses or clip-type hanging glasses.
As a specific embodiment of the present invention. See fig. 4. A pair of glasses for preventing refractive deterioration and asthenopia due to visual field asymmetry, comprising the glasses for preventing refractive deterioration and asthenopia of eyes due to visual field asymmetry as described in the above item 1 or 2, wherein the glasses are contact lenses.
As a specific embodiment of the present invention. See fig. 5. Desk-top read-write mirror. A therapeutic apparatus for preventing refractive deterioration and asthenopia caused by visual field asymmetry, comprising an ophthalmic lens for preventing refractive deterioration and asthenopia caused by visual field asymmetry as described in any one of the above, the therapeutic apparatus comprising a desk-top read-write mirror, a read-write prevention apparatus, a prevention apparatus mounted on a desk.
Examples of the invention are shown in Table 1.
TABLE 1
Table 1 illustrates:
1. Examples are given in table 1, for example, for the case of 6 ocular diopters. H is the difference between the geometric center or theoretical geometric center of the visual area S1 and the horizontal line distance L1 from the lower edge of the peripheral visual area S2, which is greater than the horizontal line distance L2 from the geometric center or theoretical geometric center of the visual area S1 to the upper edge of the peripheral visual area S2, and is simply called the height difference, and L1-L2 is more than 0.
2. Checking diopter of eyes according to scientific optometry and optometry, strictly executing the principle of no under correction and no over correction, requiring making an optometry prescription,
3. The prescription is used as the prescription parameter for the S1 upper diopter in the lens of the invention. The diopter at S2 is the value required by the invention.
4. Different 6 sets of parameter values for H and S1 diameters were selected, respectively.
5. The area of the viewing zone S1 is <700 square millimeters and the total lens area >900 square millimeters.
The clinical experiments of the present invention are reported as follows:
Experimental grouping:
The invention is compared with the prior art of the invention which uses ZL201210196959.8 to control defocus and eye diopter. The invention was divided into experimental and comparative groups.
1) The first control group, 6-17 year old adolescent myopia or astigmatism-associated patients, the experimental group of the invention was 100, the control group was 100.
2) Second control group 6-12 years old adolescent hyperopia or concomitant astigmatism patients, experimental group 50 of the invention, control group 50.
3) Third control group 6-13 teenager with normal eyes, 25 of the subject invention, control group 25.
The experiment method comprises preparing glasses according to respective regulations, and wearing all the day. The experimental time is 1 month after two years, and the results are checked for comparison.
In1 month of two years, the examination is carried out once a month, namely the eye axis, B ultrasonic and other conventional optometry projects.
Experimental results:
A) efficacy standard:
The visual acuity is improved, the objective optometry degree is not increased, the vision chart is seen by correcting the vision at the speed of 1 second, the vision is not reduced, the eye axis speed is lower than the average experience increasing value of the same age, and the B ultrasonic result is not changed abnormally.
The effective-objective optometry degree is increased to be lower than the average increment value of the same age, the corrected vision looks at the vision at the speed of 1 second, the visual acuity of the chart is not reduced, the eye axis speed is increased to be lower than the average experience increment value of the same age, and the B ultrasonic result is not changed abnormally.
The ineffective-objective optometry degree is increased to reach the average increase value of the same age, the vision correction is carried out to see the visual chart at the speed of 1 second, the vision is reduced, the eye axis speed is increased to be equal to the average experience increase value of the same age, and the B ultrasonic result is changed abnormally or not.
Second) checking results:
1) The first comparison group is an experimental group, has 83 persons with obvious effect, 14 persons with effective effect and 3 persons with ineffective effect.
The comparison group shows 48 persons with effectiveness, 46 persons with effectiveness and 6 persons with ineffectiveness.
2) The second comparison group is an experimental group, 46 people are effective, 3 people are effective, and 1 person is ineffective.
22 Persons with obvious effect, 25 persons with effective effect and 3 persons with ineffective effect.
3) And the third comparison group is an experimental group, 25 persons are effective, 0 person is effective, and 0 person is ineffective.
The comparison group shows 8 persons with effectiveness, 13 persons with effectiveness and 4 persons with ineffectiveness.
Third), analysis of results:
The statistics conclusion is that all 175 persons in the experimental group have remarkable effect of completely preventing teenagers with diopter increase, reach 154 persons, and account for 88% of the total number of the experiment. While the control group was all 175, the teenagers who completely prevented the increase in diopter with the comparative prior art were 78, accounting for 44.6% of the total population in the control group. In the experiment, the visual fatigue improvement phenomenon of the experimental group is common, the effective rate is 90%, the visual fatigue improvement effect of the comparison group is not improved, and the effective rate is 0%. (note: for presbyopia, stabilizing diopters, maintaining healthy eye vision is the goal, reducing distance vision is detrimental to vision health, so preventing abnormal reduction of distance vision is a good evaluation criterion).
Conclusion the experimental group of the invention has remarkable effect compared with the comparative group.
Those skilled in the art will be able to implement the above-described details.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the invention.
Claims (6)
1. An ophthalmic lens for preventing refractive deterioration and visual fatigue caused by visual field asymmetry is provided with a visual area S1 and a peripheral visual area S2, and is characterized in that the visual area S1 is positioned on the central deviation of the ophthalmic lens, the horizontal line distance from the geometric center or the theoretical geometric center of the visual area S1 to the lower edge of the peripheral visual area S2 is larger than the horizontal line distance from the geometric center or the theoretical geometric center of the visual area S1 to the upper edge of the peripheral visual area S2, the peripheral visual area S2 is provided with an out-of-focus lens, the diopter of the 5DS > of the out-of-focus lens is more than 0.25DS, the visual area S1 is an aperture or is provided with a non-out-of-focus correction lens, the non-out-of-focus correction lens comprises a near-sight non-out-of-focus correction lens or a far-sight non-out-focus correction lens, the astigmatic non-out-focus correction lens is also compounded on the peripheral visual area S2 is the same or basically the same astigmatic non-out-focus correction lens, and the area S1 is less than 700 square mm;
The dispersion degree is not 0 degrees;
total lens area >900 square millimeters;
the distance from the geometric center or theoretical geometric center of the viewing zone S1 to the lower edge horizontal line of the peripheral viewing zone S2 is greater than the distance from the geometric center or theoretical geometric center of the viewing zone S1 to the upper edge horizontal line of the peripheral viewing zone S2 by 3-40 mm.
2. The ophthalmic lens for preventing refractive deterioration and visual fatigue due to visual field asymmetry according to claim 1, wherein the distance from the geometric center or theoretical geometric center of the visual zone S1 to the lower edge horizontal line of the peripheral visual zone S2 is greater than the distance from the geometric center horizontal line of the visual zone S1 to the upper edge horizontal line of the peripheral visual zone S2 by 4 to 24 mm.
3. The ophthalmic lens for preventing refractive deterioration and visual fatigue due to visual field asymmetry according to claim 2, wherein the distance from the geometric center or theoretical geometric center of the visual zone S1 to the lower edge of the peripheral visual zone S2 is greater than the distance from the geometric center or theoretical geometric center of the visual zone S1 to the upper edge horizontal line of the peripheral visual zone S2 by 6 to 14 mm.
4. An ophthalmic lens for preventing refractive deterioration and asthenopia due to visual field asymmetry according to any one of claims 1 to 3, wherein the visual zone S1 is circular and has a diameter of 5 to 25mm.
5. An ophthalmic lens for preventing refractive deterioration and asthenopia due to visual field asymmetry according to any one of claims 1 to 4, which is a conventional frame type ophthalmic lens or a clip type hanging lens.
6. A therapeutic apparatus for preventing refractive deterioration and asthenopia caused by visual field asymmetry, comprising an ophthalmic lens for preventing refractive deterioration and asthenopia caused by visual field asymmetry according to any one of claims 1 to 4, the therapeutic apparatus comprising a desk-top reading/writing mirror, a reading/writing prevention instrument, and a prevention instrument mounted on a desk.
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| CN205982877U (en) * | 2016-08-30 | 2017-02-22 | 戴明华 | Make preventing and treating myopia lens, glasses and reading and writing appearance of peripheral myopia nature out of focus |
| CN209044216U (en) * | 2018-09-28 | 2019-06-28 | 戴明华 | Prevent visual field asymmetry from leading to the spectacle lens and therapeutic equipment of dioptric deterioration and visual fatigue |
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