Progressive defocus hyperopic correction spectacles and design method thereof

Abstract

The present application belongs to the technical field of medical equipment, and particularly relates to a progressive defocus hyperopia correction glasses and a design method thereof, which has a lens structure with three functional partitions, the lens structure comprising a base lens, a central correction area in a central part of the base lens, a ring-shaped transition stimulation area outside the central correction area, and a peripheral strengthening area outside the transition stimulation area. The design of the progressive hyperopia defocus amount of the present application conforms to the effect that the retinal morphology forms a stepwise increase of the hyperopia defocus amount when transitioning from the macular area to the peripheral retina, and has a good vision correction and hyperopia treatment effect: the central area forms a clear object image, without affecting the patient's amblyopia training; the central peripheral visual field is relatively clear, ensuring the visual quality; the peripheral retina forms hyperopia defocus, promoting the growth of the eye axis and the decrease of the hyperopia degree.

Description

Technical Field

[0001] This invention belongs to the field of medical device technology, specifically relating to a progressive defocus hyperopia correction eyeglass and its design method. Background Technology

[0002] Hyperopia primarily arises from the lag of the eye's refractive system in focusing behind the retina, mainly due to an excessively short axial length (axial hyperopia). Children with moderate to high hyperopia have significantly shorter axial lengths than the physiological average, resulting in a chronically "hyperopic defocus" environment where the retina is in a state of optical defocus. This leads to a very high incidence of amblyopia and often results in esotropia and abnormal stereopsis development. Traditional correction methods rely on single-power convex lenses to compensate for refractive errors. While this improves image clarity, it fails to provide the biostimulatory signals that promote axial growth, making it difficult for the patient's hyperopia to naturally decline with age.

[0003] In recent years, multifocal myopia defocus technology has made groundbreaking progress in the field of myopia control. Its principle involves creating a myopic defocus signal in the peripheral retina, activating retinal regulatory pathways, and inhibiting abnormal axial elongation. Clinical trials have shown that these lenses can slow the progression of myopia in adolescents by 30%-70%. However, there is still a gap in optical control technology for hyperopia treatment: existing methods are limited to passive correction and lack an optical driving mechanism that actively intervenes in axial growth. Summary of the Invention

[0004] The purpose of this invention is to provide a progressive defocus hyperopia correction eyeglass and its design method, which reverses the application of multifocal defocus theory to hyperopia treatment and proposes "hyperopia-driven axial elongation": by providing precise refractive correction in the central retinal area through lens optical design, and combined with progressive multifocal design, progressive hyperopia defocus is superimposed from the lateral central to the peripheral visual field to simulate the optical stimulation environment required for physiological axial elongation, thereby promoting axial elongation and reducing hyperopia.

[0005] To achieve the above objectives, this application employs the following technical solution:

[0006] A progressive defocus hyperopia correction eyeglass and its design method are disclosed. The eyeglass has a three-level functional zone lens structure. The lens structure includes a base lens, which is a positive lens configured according to the user's refraction results. The central part of the base lens is a central correction zone. The center of the central correction zone is on the same optical axis as the center of the user's retinal macular area when the user wears glasses normally and looks straight ahead.

[0007] A ring-shaped transitional stimulation zone is located outside the central correction zone. The geometric center of the transitional stimulation zone coincides with the center of the central correction zone. M groups of first microlenses with negative refractive power are set on the base lens corresponding to the transitional stimulation zone, where M is a natural number. Each group of first microlenses is arranged in a circle around the center of the central correction zone, and the refractive power of the first microlenses in the same group is equal. Extending outward from the first group of first microlenses closest to the central correction zone, the refractive power of the first microlenses in each group is not exactly the same.

[0008] Located outside the overstimulation zone is the peripheral reinforcement zone, which consists of 2-4 sets of negative diopter second microlenses placed on the base lens. Each set of second microlenses is arranged in a circle around the center of the lens, and all the second microlenses in the peripheral reinforcement zone have the same diopter.

[0009] Furthermore, in the first microlens of group M in the transition stimulation zone, the value of M ranges from 4 to 8.

[0010] Furthermore, the front view of the central correction area is circular, and its diameter is... Determined based on the following formula:

[0011] ,

[0012] In the formula, , Where VD is vertex distance, AL is axial length, CCT is corneal thickness, ACD is anterior chamber depth, and LT is lens thickness. The diameter of the macular region must be determined based on the patient's examination results. is the refractive index of the medium inside the eyeball, with a value ranging from 1.33 to 1.34, and n is the refractive index of air, with a value of 1.

[0013] Furthermore, the refractive power of each group of first microlenses is determined according to the following formula:

[0014] S1, the refractive power of the first microlens in the first group. for:

[0015] In the formula The refractive error value for prescription lenses is obtained from a normal eye exam. This is the initial defocus factor, and its value ranges from 40% to 60%.

[0016] S2. The refractive power values ​​of the remaining groups of first microlenses are determined through the following calculation steps:

[0017]

[0018] In the formula, The equivalent focal length of the combined optical system formed by the first microlens in group M, the base lens, and the human eye is given. denoted as the refractive power of the first microlens in group M.

[0019] Furthermore, the number M of the first microlens group in the transition stimulation region must satisfy:

[0020] In the formula, max represents the maximum number of sets in the transition stimulation zone. This is an approximate calculation of the eyeball radius. .

[0021] Furthermore, the refractive power of the second microlens is equal to the refractive power of the first microlens group with the largest subscript m.

[0022] The beneficial effects of this invention are:

[0023] The design of the gradual hyperopic defocus amount conforms to the effect of the retinal morphology transitioning from the macular area to the peripheral retina, resulting in a stepwise increase in hyperopic defocus amount. It has a good effect on vision correction and hyperopia treatment: 1. It ensures that a clear image is formed in the central area, without affecting the patient's amblyopia training; 2. It has a relatively clear central para-field of vision, ensuring visual quality; 3. It forms peripheral retinal hyperopic defocus, promoting axial elongation and reducing hyperopia. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the progressive defocus hyperopia correction glasses of the present invention.

[0025] Figure 2 The equivalent optical path diagram of the progressive defocus hyperopia correction glasses of the present invention is located on a radius.

[0026] Explanation of reference numerals in the attached figures:

[0027] 1. Central correction zone; 2. Transitional stimulation zone; 3. Peripheral reinforcement zone; 4. Base lens; 5. Lens; 6. Retina; 8. Peripheral focal plane; 7a, 7b, 7c, different transitional focal planes. Detailed Implementation

[0028] The technical solution of the present invention will be described in detail below with reference to the accompanying drawings. The following embodiments are merely exemplary and can only be used to explain and illustrate the technical solution of the present invention, and should not be construed as limiting the technical solution of the present invention.

[0029] like Figure 1As shown, this application relates to a progressive defocus hyperopia correction eyeglass and its design method, featuring a lens structure with three functional zones. The lens structure includes a base lens, which is a positive lens configured according to the user's refraction results. Its refractive power is determined based on the patient's cycloplegic hyperopia, consistent with traditional hyperopia prescription principles. The central portion of the base lens is the central correction zone, the center of which is aligned with the center of the user's macula when the user is wearing glasses normally and looking straight ahead.

[0030] A ring-shaped transitional stimulation zone is located outside the central correction zone. The geometric center of the transitional stimulation zone coincides with the center of the central correction zone. M groups of first microlenses with negative refractive power are set on the base lens corresponding to the transitional stimulation zone, where M is a natural number. Each group of first microlenses is arranged in a circle around the center of the central correction zone, and the refractive power of the first microlenses in the same group is equal. Extending outward from the first group of first microlenses closest to the central correction zone, the refractive power of the first microlenses in each group is not exactly the same.

[0031] Located outside the overstimulation zone is the peripheral reinforcement zone, which consists of 2-4 sets of negative diopter second microlenses placed on the base lens. Each set of second microlenses is arranged in a circle around the center of the lens, and all the second microlenses in the peripheral reinforcement zone have the same diopter.

[0032] The central correction zone is circular in frontal view, and its diameter is... Based on the following formulas, it should satisfy formulas (1)-(3):

[0033] (1)

[0034] In the formula:

[0035] (2)

[0036] (3)

[0037] Where VD is vertex distance, AL is axial length, CCT is corneal thickness, ACD is anterior chamber depth, and LT is lens thickness. The diameter of the macular region must be determined based on the patient's examination results. is the refractive index of the medium inside the eyeball, which generally ranges from 1.33 to 1.34, and n is the refractive index of air, which is 1.

[0038] In this application, the central correction zone has no other structure except for the positive lens shape formed according to the refractive power of the base lens.

[0039] The refractive power of the first microlens in each group is determined according to the following formula:

[0040] First, the refractive power of the first microlens in the first group. :

[0041] (4)

[0042] In the formula The refractive error value for prescription lenses is obtained from a normal eye exam. The initial defocus coefficient ranges from 40% to 60%, and is determined based on a comprehensive analysis of the patient's age, degree of hyperopia, and rate of axial length growth in the early stages.

[0043] Calculate the defocus distance formed by the first lens in the first group based on the refractive power of the first microlens in the first group:

[0044] (5)

[0045] (6)

[0046] In the formula This is the equivalent focal length of the combined optical system formed by the first microlens, the base lens, and the human eye in the first group. The defocus distance formed by the first microlens of the first group on the retina.

[0047] The refractive power values ​​of the remaining groups of first microlenses were determined through the following calculation steps:

[0048] (7)

[0049] In the formula The distance between the center of the first microlens in group M and the center of the central correction area must satisfy the following conditions:

[0050] (8)

[0051] (9)

[0052] The radius of the first microlens is 0.1 to 0.3 mm. The distance between the image of the center of the first microlens in group M on the retina after passing through the human eye's optical system and the central area of ​​the macula.

[0053] (10)

[0054] The number M of the first microlens group in the transition stimulation region must satisfy:

[0055] (11)

[0056] In the formula, max represents the maximum number of groups in the transition stimulation zone.

[0057] (12)

[0058] In the formula This is an approximate calculation of the eyeball radius. The angle between the center of the first microlens in group M and the equivalent imaging point on the retina and the axial length of the eye.

[0059] , (13)

[0060] In the formula The defocus distance formed by the first microlens in group M on the retina. The gradient coefficient of the first microlens in group M ranges from 20% to 40%, and is determined based on a comprehensive analysis of the patient's age, degree of hyperopia, and rate of axial length growth in the early stage.

[0061] (14)

[0062] (15)

[0063] In the formula The equivalent focal length of the combined optical system formed by the first microlens in group M, the base lens, and the human eye is given. denoted as the refractive power of the first microlens in group M.

[0064] The refractive power of the second microlens is equal to the refractive power of the first microlens group with the largest subscript m.

[0065] The equivalent optical path diagram of the hyperopia correction lens of the present invention, located on a radius, is as follows: Figure 2 As shown. The base lens 4 is a positive lens, and the microlenses on the base lens are negative lenses. This optical structure creates a combination of lenses with different refractive powers from the center outwards. Parallel light rays entering the central correction zone are focused onto the retina 6 after passing through the base lens 4 and the lens 5. Parallel light rays entering the transitional stimulation zone are focused onto different transitional focal planes 7a, 7b, 7c, etc., behind the retina 6 after passing through the base lens 4 and the lens 5. The farther the light rays are from the center of the lens, the farther the focusing plane is from the retina. Parallel light rays entering the peripheral reinforcement zone are focused onto the peripheral focal plane 8 behind the retina 6 after passing through the base lens 4 and the lens 5, which is the farthest from the retina 6.

[0066] Example 1

[0067] The patient's right eye examination results are as follows: axial length 19.0 mm, anterior chamber depth 3.2 mm, corneal thickness 0.5 mm, lens thickness 3.2 mm, macular diameter 6.0 mm, vertex distance 12.0 mm, prescribed refractive power +5.00D, initial defocus coefficient set at 50%, progressive coefficients set at 30%, microlens radius set at 0.2 mm, the first group of microlenses is positioned 4.1 mm from the center of the central correction zone, and each subsequent group increases the distance by 1 mm, for a total of 7 groups of microlenses. Therefore, the central correction zone diameter of the right lens is 7.65 mm. From the innermost to the outermost microlens group, the refractive powers are: -2.50D, -3.36D, -3.56D, -3.83D, -4.18D, -4.64D, -5.27D. The outer reinforcement zone is equipped with three sets of lenses, each with a diopter of -5.27D.

[0068] The patient's left eye examination results are as follows: axial length 20.0 mm, anterior chamber depth 3.2 mm, corneal thickness 0.5 mm, lens thickness 3.2 mm, macular diameter 6.0 mm, vertex distance 12.0 mm, prescribed refractive power +3.00D, initial defocus coefficient set at 50%, progressive coefficients set at 30%, microlens radius set at 0.2 mm, the first group of microlenses is set to a distance of 4 mm from the center of the central correction zone, and each subsequent group of microlenses increases the distance from the center of the central correction zone by 1 mm, for a total of 7 groups of microlenses. Therefore, the central correction zone diameter of the left lens is 7.45 mm, and the refractive powers of each group of microlenses from the inside out are: -1.50D, -2.03D, -2.15D, -2.30D, -2.51D, -2.79D, -3.18D. The outer reinforcement zone is equipped with three sets of lenses, each with a diopter of -3.18D.

[0069] Example 2

[0070] The patient's right eye examination results are as follows: axial length 21.5 mm, anterior chamber depth 3.1 mm, corneal thickness 0.5 mm, lens thickness 3.1 mm, macular diameter 6.0 mm, vertex distance 12.0 mm, prescribed refractive power +2.00D, initial defocus coefficient set at 40%, progressive coefficient set at 25%, microlens radius set at 0.3 mm, the first group of microlenses is positioned 4.1 mm from the center of the central correction zone, and each subsequent group increases this distance by 1.2 mm, for a total of 6 groups of microlenses. Therefore, the central correction zone diameter of the right lens is 6.75 mm. From the innermost to the outermost microlens, the refractive powers of each group are: -0.80D, -1.05D, -1.13D, -1.24D, -1.40D, and -1.63D. Three groups of lenses are placed in the peripheral resonant zone, each with a refractive power of -1.63D.

[0071] The patient's left eye examination revealed the following: axial length 21.0 mm, anterior chamber depth 3.1 mm, corneal thickness 0.5 mm, lens thickness 3.1 mm, macular diameter 6.0 mm, vertex distance 12.0 mm, and a prescription refractive power of +2.50D. The initial defocus coefficient was set at 40%, the progressive coefficients at 25%, and the microlens radius at 0.3 mm. The first group of microlenses was positioned 3.8 mm from the center of the central correction zone, with each subsequent group increasing by 1.2 mm, for a total of 6 groups. Therefore, the central correction zone diameter of the left lens is 6.94 mm. From the innermost to the outermost microlens group, the refractive powers are: -1.00D, -1.31D, -1.41D, -1.55D, -1.75D, and -2.03D. Three lenses, each with a refractive power of -2.03D, were placed in the peripheral resonant zone.

[0072] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the technical solutions of the present invention, and these modifications or equivalent substitutions cannot cause the modified technical solutions to deviate from the scope of the technical solutions of the present invention.

Claims

1. A type of progressive defocus hyperopia correction glasses, characterized in that, The lens structure has a three-level functional zone, the lens structure includes a base lens, the base lens is a positive lens configured according to the user's refraction results, the central part of the base lens is the central correction zone, the center of the central correction zone is on the same optical axis as the center of the user's retinal macular area when the user wears glasses normally and looks straight ahead; A ring-shaped transitional stimulation zone is located outside the central correction zone. The geometric center of the transitional stimulation zone coincides with the center of the central correction zone. M groups of first microlenses with negative refractive power are set on the base lens corresponding to the transitional stimulation zone, where M is a natural number. Each group of first microlenses is arranged in a circle around the center of the central correction zone, and the refractive power of the first microlenses in the same group is equal. Extending outward from the first group of first microlenses closest to the central correction zone, the refractive power of the first microlenses in each group is not exactly the same. The outer part of the overstimulation zone is the peripheral reinforcement zone. The peripheral reinforcement zone consists of 2-4 sets of second microlenses with negative refractive power placed on the base lens. Each set of second microlenses is arranged in a circle around the center of the lens, and all the second microlenses in the peripheral reinforcement zone have the same refractive power. The central correction zone is circular in frontal view, and its diameter is... Determined based on the following formula: ， In the formula, , Where VD is vertex distance, AL is axial length, CCT is corneal thickness, ACD is anterior chamber depth, and LT is lens thickness. The diameter of the macular region must be determined based on the patient's examination results. is the refractive index of the medium inside the eyeball, with a value ranging from 1.33 to 1.34, and n is the refractive index of air, with a value of 1.

2. The progressive defocus hyperopia correction glasses according to claim 1, characterized in that, In the first microlens of group M in the transition stimulation region, the value of M ranges from 4 to 8.

3. The progressive defocus hyperopia correction glasses according to claim 1, characterized in that, The refractive power of the first microlens in each group is determined according to the following formula: S1, the refractive power of the first microlens in the first group. for: In the formula The refractive error value for prescription lenses is obtained from a normal eye exam. This is the initial defocus factor, and its value ranges from 40% to 60%. S2. The refractive power values ​​of the remaining groups of first microlenses are determined through the following calculation steps: ； In the formula, The equivalent focal length of the combined optical system formed by the first microlens in group M, the base lens, and the human eye is given. denoted as the refractive power of the first microlens in group M.

4. The progressive defocus hyperopia correction glasses according to claim 3, characterized in that, The number M of the first microlens group in the transition stimulation region must satisfy: In the formula, max represents the maximum number of sets in the transition stimulation zone. This is an approximate calculation of the eyeball radius. .

5. The progressive defocus hyperopia correction glasses according to claim 4, characterized in that, The refractive power of the second microlens is equal to the refractive power of the first microlens group with the largest subscript m.

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