Optical lens for correcting strabismus

Abstract

The present invention discloses an ophthalmic lens for correcting strabismus. One side of the lens is a light incident surface, and the other side is a light exit surface, wherein the light exit surface is a plane; a plurality of parallel and closely connected serrated microstructures are provided on the light incident surface, wherein the serrated microstructures are connected by tooth units consisting of a plurality of tooth surfaces A and tooth surfaces B, wherein the longitudinal section of each tooth unit is triangular, wherein the angle between the tooth surface A and the light exit surface is α, and the angle between the tooth surface A and the tooth surface B is β, and 180°>α+β≥90°; the tooth surfaces A and tooth surfaces B in adjacent tooth units are parallel, and the intersection lines of the tooth surfaces A and tooth surfaces B in all serrated microstructures are respectively located on the same plane parallel to the light exit surface. The present invention can achieve light changes to achieve the effect of correcting strabismus; at the same time, the scale of the microstructure is smaller than the naked eye resolution of the human eye, and there are no obvious stripes visually. When used as a lens and worn on the user's face, the eyeglass lens is friendly and comfortable to wear.

Description

Technical Field

[0001] The invention belongs to the technical field of optical design, and in particular relates to an optical lens for correcting strabismus. Background Art

[0002] Strabismus is an abnormal eye condition and a common eye disease that causes visual development disorders in children. It refers to the inability of both eyes to focus on the same target at the same time. When one eye is looking, the other eye deviates. This symptom may occur occasionally, which is called intermittent strabismus, or it may exist all the time, which is called constant strabismus. Strabismus not only affects appearance, but more importantly, it affects the patient's visual function, including binocular fusion vision and binocular stereoscopic vision. As a result, patients cannot accurately identify the distance and three-dimensional sense of objects in daily life, work and sports, have difficulty reading, and their eyes are easily fatigued. Because the image of one eye is suppressed, the single vision function and three-dimensional sense of both eyes are lost. If not treated or corrected in time, it can also lead to poor vision development and cause amblyopia or even blindness.

[0003] Because strabismus is currently not covered by physical examinations, it is often very hidden in the early stages. When strabismus is discovered, patients often do not know how to deal with it. This leads to the aggravation of strabismus symptoms. In recent years, the market has mainly sold products similar to eye patches that cover one eye to improve strabismus. These products cover the eye with better vision and force the poorer eye to use it, which is used to exercise the eye. Medically, different measures are taken according to the patient's different conditions. For patients with severe strabismus, if the patient is willing to undergo surgery, surgery can be performed to correct or improve the condition.

[0004] Currently, there are no suitable methods for ophthalmic correction. For lower degrees of strabismus (e.g., less than 15 degrees), doctors recommend wearing prisms for correction. However, prisms are thick and uncomfortable to wear, making them difficult for patients to accept. The only available film is only suitable for lower degrees of strabismus (less than 15 degrees) and has obvious stripes, making it difficult for wearers to accept. For higher degrees of strabismus, there is still no good ophthalmic solution. Therefore, the market urgently needs an ophthalmic solution that can correct strabismus through glasses. Summary of the Invention

[0005] In response to the shortcomings of the existing technology, the purpose of the present invention is to provide a thin and lightweight optical lens that uses a designed microstructure to achieve light modification to correct strabismus. The present invention can achieve different degrees of strabismus correction by changing the inclination angle and structure of the microstructure, covering high degrees (such as above 60 degrees) and low degrees (below 15 degrees). At the same time, the scale of the designed microstructure is smaller than the naked eye resolution of the human eye, there are no obvious visual stripes, and the wearer is friendly and comfortable.

[0006] The technical solution of the present invention is specifically described as follows.

[0007] The present invention provides an optical lens for correcting strabismus, one side of the lens is the light incident surface, and the other side is the light

[0008] The exit surface and the light exit surface are planes; the light incident surface is provided with a number of parallel and closely connected serrated microstructures, the serrated microstructures are connected by tooth units consisting of a number of tooth surfaces A and tooth surfaces B, the longitudinal section of each tooth unit is triangular, the angle between the tooth surface A and the light exit surface is α, α is an acute angle, the angle between the tooth surface A and the tooth surface B is β, 180°>α+β≥90°; the tooth surfaces A and tooth surfaces B in adjacent tooth units are parallel, and the intersection lines of the tooth surfaces A and tooth surfaces B in all serrated microstructures are respectively on the same plane parallel to the light exit surface.

[0009] In the present invention, in the sawtooth microstructure, the width of the tooth groove is between 10-200 μm.

[0010] In the present invention, in the sawtooth microstructure, the end surface of the tooth top or tooth root is in an arc shape, and the arc radius is r ≤ 15μm.

[0011] In the present invention, the light incident surface is coated with a blue light blocking film, an ultraviolet blocking film or an anti-reflection film.

[0012] In the present invention, different degrees of strabismus correction are achieved mainly by adjusting the included angle α between the tooth surface A and the light emitting surface.

[0013] The present invention further provides the use of the above-mentioned ophthalmic lens as a lens or a spectacles clip in spectacles for correcting strabismus.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] The strabismus correction lens of the present invention has the advantages of being light and thin, highly transparent, having no visually obvious stripes, and being flexible in configuration. The lens can be independently made into glasses or can be used as an accessory for other glasses, such as a clip-on lens. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 Schematic diagram of lens changing the light path.

[0017] Figure 2 Schematic diagram of the structure of an optical lens for correcting strabismus.

[0018] Figure 3 The microstructural parameters of the sawtooth are defined as follows: L: tooth width; α: angle between tooth surface A and the plane; β: angle between tooth surface B and tooth surface A; where (a) α and β satisfy α + β = 90°; (b) is the general case, satisfying α + β > 90°; the radius of the tooth top or tooth root arc isr , r ≤ 15μm.

[0019] Figure 4 Embodiments of an ophthalmic lens for correcting strabismus: (a) glasses for correcting strabismus; (b) clip-on glasses for correcting strabismus.

[0020] Numbers in the figure: 1-light; 2-microstructure lens; 3-serrated microstructure; 4-light emitting surface; 5-frame; 6-lens; 7-lens clamping structure. DETAILED DESCRIPTION

[0021] The technical solution of the present invention is described in detail below with reference to the accompanying drawings and embodiments.

[0022] The light and thin optical lens provided by the present invention is different from the traditional prism. The present invention realizes the change of light 1 (such as Figure 1 As shown in the figure, strabismus correction is achieved; by changing the inclination angle and structure of the microstructure, different strabismus correction degrees can be achieved, covering high degrees (such as more than 60 degrees) and low degrees (less than 15 degrees). For different strabismus corrections, it is mainly achieved by adjusting the hypotenuse angle α, for example, For strabismus correction of degrees (prism diopter), the angle α can be calculated according to the formula Obtain, among which is the refractive index of the lens material.

[0023] In an embodiment, an optical lens for correcting strabismus is provided, and the lens structure is as follows:

[0024] 1. The light exit surface 4 is flat, and the light incident surface has a sawtooth microstructure 3; Figure 2 As shown in the figure below, the straight lines in the left figure are the horizontal projections of the sawtooth structure in the right figure (looking from top to bottom), and the distance between adjacent lines is the tooth width; the definition parameters of the sawtooth are as follows Figure 3 As shown, it includes the angle between tooth surface A and the plane, the angle between tooth surface B and tooth surface A, tooth groove width L, and tooth top or tooth root arc radius;

[0025] 2. The serrated microstructures 3 are arranged in parallel and closely connected. When manufacturing the lens, the direction of the serrated structure can be adjusted according to the squint situation, such as horizontal or vertical direction;

[0026] 3. The tooth width of the serrated structure is not greater than 0.2mm, the radius of the tooth top or tooth root is not greater than 15µm, and no obvious visual stripes are produced;

[0027] 4. The lens material is transparent plastic, including various optical resins, which can be soft or hard. The refractive index of the material is n , strabismus correction prism diopter The angle α between the sawtooth bevel and the sawtooth bevel satisfies the relationship For example, the refractive index n of the commonly used lens resin material PMMA is 1.5, the microstructure angle α is 15°, and the diopter is It's about 13.6 degrees;

[0028] 5. The lens can be made by injection molding or rolling, and can be cut during the manufacturing process;

[0029] 6. The lens surface can be coated as needed, such as anti-blue light, ultraviolet, anti-reflection and other coatings.

[0030] When the optical lens of the present invention is used to correct strabismus, it can be directly used as the lens 6 of glasses and mounted on the frame 5 ( Figure 4 (a)), or as a clip-on lens ( Figure 4 (b) The lens is mounted on the frame 5 using the lens holding structure 7 and then worn on the user's face.

[0031] As described above, the present invention realizes light changes through the designed microstructure to achieve the effect of correcting strabismus; at the same time, the scale of the microstructure is smaller than the naked eye resolution of the human eye, there are no obvious visual stripes, and it is friendly and comfortable to wear.

Claims

1. An ophthalmic lens for correcting strabismus, used as a lens or a clip-on lens in glasses for correcting strabismus, characterized in that: One side of the lens is the light incident surface, and the other side is the light exit surface, and the light exit surface is a plane; the light incident surface is provided with a number of parallel and closely connected serrated microstructures, which are connected by tooth units consisting of a number of tooth surfaces A and tooth surfaces B. The longitudinal section of each tooth unit is triangular, and the angle between tooth surface A and tooth surface B is β, where α is an acute angle, and 180°>α+β≥90°; the tooth surfaces A and tooth surfaces B in adjacent tooth units are parallel, and the intersection lines of tooth surfaces A and tooth surfaces B in all serrated microstructures are respectively located on the same plane parallel to the light exit surface; wherein: When using ophthalmic lenses for strabismus correction, they are directly used as glasses lenses and mounted on the frames, or as glasses clips, mounted on the frames using a lens clamping structure, and then worn on the user's face; By adjusting the angle α between the tooth surface A and the light exit surface, different strabismus correction degrees can be achieved, and strabismus correction of Δ degrees of prism diopter can be achieved. The angle α is obtained according to the formula Δ=100sin(arcsin(nsinα)-α), where n is the refractive index of the lens material; In the serrated microstructure, the tooth width is between 10 and 200 μm; The end surface of the tooth top or tooth root in the serrated microstructure is in an arc shape, and the arc radius r is ≤ 15 μm.

2. Use of the strabismus-correcting optical lens according to claim 1 as a lens or a clip-on lens in glasses for correcting strabismus, characterized in that: The light incident surface is coated with an anti-blue light film, an anti-ultraviolet film or an anti-reflection film.

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