A personalized peripheral myopic defocused spectacle lens and its design and preparation method

Abstract

The present invention relates to a personalized peripheral myopic defocus spectacle lens and a design and preparation method. The emmetropia myopia degree of a myopic patient and the refractive power of the naked eye in each viewing angle direction are measured respectively to obtain the peripheral hyperopic defocus value of the myopic patient; the intersection position of the sight line of the myopic patient in each viewing angle direction and the lens is used as the focal compensation reference point of the lens design, and 105% to 120% of the corresponding peripheral hyperopic defocus value of the myopic patient is used as the focal compensation value, and the lens is designed with asymmetric peripheral focal compensation, and after obtaining the initial lens sagitta, the initial lens sagitta is corrected by an additional prism method according to the parameters of the glasses frame to be worn by the myopic patient, so as to obtain a personalized peripheral myopic defocus spectacle lens. The spectacle lens provided by the present invention is suitable for teenagers to wear, can correct vision, and can inhibit the eyeball from stretching backwards during the growth period, and control the deepening of myopia; it conforms to the principle of ergonomics, and is both functional and easy to adapt.

Description

Technical Field

[0001] The invention relates to a spectacle lens for correcting myopia, and in particular to a myopic defocus spectacle lens for correcting peripheral hyperopic defocus of the retina, and a design and preparation method thereof. Background Art

[0002] Since the physiological structure of the retina is not a standard sphere, the peripheral curvature tends to be steeper than the central macula. Only objects directly in the central field of view of the eye, that is, on-axis and near-axis objects, are imaged on the fovea of ​​the eye. Off-axis objects outside the central field of view are imaged on the posterior side of the peripheral retina outside the fovea, which is called peripheral hyperopic defocus. See Appendix. Figure 1 , is a schematic diagram of peripheral hyperopic defocus imaging of naked eyes. That is, the naked eye itself has relative hyperopic defocus RPRE (relative peripheral refractive error) in the peripheral retina. For myopia that focuses distant targets in front of the retina, single-focus myopia lenses are usually used for correction. Since single-focus myopia lenses only provide the clearest correction for central vision, this relative peripheral defocus will be converted into absolute peripheral defocus after the wearer uses a correction lens for the central macula. Moreover, the off-axis aberrations in the single-focus myopia lenses themselves will aggravate this peripheral hyperopic defocus. In multiple nasotemporal peripheral refractive power measurements using an open ophthalmometer, it has been found that the peripheral hyperopic defocus of most myopic people after wearing glasses is higher than that of the naked eye. Current studies have shown that, especially for adolescents, peripheral hyperopic defocus will induce the eye's adaptive system to promote the posterior growth of the eye axis, resulting in accelerated growth of the eye axis and further deepening of myopia. Judging from the application of orthokeratology lenses and soft multifocal contact lenses with peripheral myopic defocus to control myopia in recent years, peripheral myopic defocus can help reduce axial growth, slow the progression of myopia and reduce the final degree of myopia when accurate correction is made in the central macular area of ​​the retina.

[0003] At the same time, clinical testing practices in recent years have shown that the distribution of peripheral hyperopic defocus in the retina of children with myopia is different for different individuals and for the same individual in terms of near and far axes. The temporal side is larger than the nasal side, and the larger the angle, the more obvious it is. Ordinary lenses that reduce peripheral hyperopic defocus do not take into account the differentiated actual measurement values ​​of the peripheral defocus of the human eye, but directly use a unified empirical value. Under the current limited defocus design, the effect of myopic defocus in each area will be discounted, thereby reducing the functionality of the lens in delaying the growth of the eye axis.

[0004] In addition, the glasses worn by myopic patients are made of lenses embedded in the frames and placed on the bridge of the nose. Figure 2 , which is a schematic diagram of a vertical tilt of the lens after the wearer puts on the glasses in the prior art; the lens is tilted vertically relative to the front sight line of the eye, and the vertical tilt angle . See attached Figure 3 , which is a schematic diagram of the horizontal tilt of the lenses after the wearer puts on the glasses in the prior art; there is a horizontal tilt relative to the vertical plane of the front sight line, and the horizontal tilt angle of the left mirror is , the horizontal tilt angle of the right lens. Compared with the state of no tilt of the lens, the tilt of the lens causes the light to deflect after passing through the lens, increasing the prism effect of the lens, and the imaging of the near-axis object in the central field of view deviates. The off-axis object outside the central field of view is imaged on the peripheral retina outside the fovea, and the backward displacement distance is asymmetrical up and down and left and right. The prism effect, optical power, and astigmatism actually felt by the human eye have all changed, which not only brings discomfort to the wearer, but also easily causes adverse effects on the eyes. This discomfort will affect the wearer's compliance with the use of peripheral myopia defocus glasses, and ultimately affect the effect of the lens. The tilt of the lens caused by wearing glasses also causes the myopia defocus compensation value actually received by the human eye to deviate from the original design value, which reduces the myopia defocus effect.

[0005] Chinese invention patent CN101317120B provides a lens designed for correcting peripheral hyperopic defocus of the retina, providing two optical correction areas in a rotationally symmetrical form, respectively correcting myopia or hyperopia associated with the fovea and peripheral areas of the eye; Chinese invention patent CN101663609B considers the amplitude of the wearer's eyeball and head movement, and determines the lens center correction area associated with the fovea and the lens peripheral correction area associated with the retinal peripheral area; Chinese invention patent CN104090381A provides a lens with different correction degrees prepared on the nasal side and the temporal side, and the correction degree on the nasal side is greater than the correction degree on the temporal side. The existing technical solutions neither mention targeted design based on the actual measured value of the peripheral hyperopic defocus of the naked eye retina, nor mention the influence of the tilt of the lens after the wearer wears the glasses assembled by embedding the lens into the glasses frame. Summary of the invention

[0006] In view of the deficiencies in the prior art, the present invention provides a personalized peripheral myopic defocus eyeglass lens suitable for teenagers to wear, which can not only correct vision but also inhibit the backward elongation of the eyeball during the growth period and control the deepening of myopia, as well as a design and preparation method.

[0007] The technical solution to achieve the purpose of the present invention is to provide a method for designing a personalized peripheral myopic defocus spectacle lens, wherein the design of the inner surface of the lens comprises the following steps:

[0008] (1) Measure the emmetropia and myopia of myopic patients and the refractive power of the naked eye in each viewing angle direction, including 10 degrees, 20 degrees, and 30 degrees on the nasal side of the naked eye, 10 degrees, 20 degrees, and 30 degrees on the temporal side, 10 degrees and 20 degrees on the upper far vision, and 10 degrees and 20 degrees on the lower near vision. The difference between the measured refractive power in each viewing angle direction and the patient's emmetropia refractive power is the peripheral hyperopic defocus value of the myopic patient.

[0009] (2) Determine the intersection of the line of sight and the lens at each viewing angle of the myopic patient. The point corresponding to 10 degrees of near vision is 1 mm inward to the nose, and the point corresponding to 20 degrees of near vision is 2 mm inward to the nose. The 10 positions obtained on the lens are used as the reference points for the optical power compensation of the lens design.

[0010] (3) For each focal compensation reference point in step (2), 105% to 120% of the peripheral hyperopic defocus value of the myopic patient corresponding to step (1) is used as the focal compensation value, and an asymmetric peripheral focal compensation design is performed on the lens to obtain an initial lens sagittal height;

[0011] (4) According to the parameters of the glasses frame that the myopic patient wants to wear, the initial lens sagittal height is corrected by adding a prism to obtain a personalized peripheral myopic defocused eyeglass lens.

[0012] The parameters of the glasses frame described in the present invention include the eye-eye distance, the vertical tilt angle and the horizontal tilt angle of the glasses frame after the myopic patient wears the glasses; the additional prism is arranged, and its vertical height difference is 3-5.5mm and the horizontal height difference is 2.2-4.5mm.

[0013] The technical solution of the present invention also includes a personalized peripheral myopia defocus spectacle lens obtained according to the above design method.

[0014] The personalized peripheral myopic defocus spectacle lens has a central focal power range of -1.00D to -10.00D obtained according to the emmetropia of the myopic patient; and the outer surface of the lens is a spherical surface.

[0015] The technical solution of the present invention provides a method for preparing a personalized peripheral myopic defocus spectacle lens, wherein the inner surface of the lens is processed in a lathe.

[0016] In order to accurately compensate for the defect of peripheral hyperopic defocusing that may occur when children wear ordinary myopia glasses, which may lead to worsening of myopia, and to make up for the deficiency that after the wearer wears the glasses and inserts the lenses into the frames, the lenses are tilted and the image is imaged behind the peripheral retina at a distance that is asymmetrical in the upper and lower directions and in the left and right directions, the present invention provides a peripheral myopic defocus lens designed in accordance with the frame inclination angle, the lens-eye distance and the measured value of the peripheral hyperopic defocusing of the retina of the myopic eye. The myopia degree of the lens outside the central field of view is lower than that of the central field of view, and the lens is designed with asymmetric optical focal length differential compensation based on the measured peripheral hyperopic defocusing value of the myopic eye. The lens also has prism compensation, so that off-axis objects are imaged basically symmetrically in front of the peripheral retina, reducing the stimulation of axial lengthening and playing a role in controlling the worsening of myopia. See attached Figure 4 , which is a schematic diagram of the effect of a personalized peripheral myopic defocus imaging principle provided by the present invention; after a myopic patient wears a myopic defocus lens 5, the light 2 emitted by the central field object of the object 6 in the field of view is imaged on the fovea 1 of the retina, and the light 3 and light 4 emitted by the off-axis object are imaged in front of the peripheral retina, changing the hyperopic defocus to myopic defocus.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] 1. The optical power in four directions of up, down, left and right around the lens is compensated according to the actual measured value. The central area of ​​the lens produces a clear correction for the central vision of the eye, and the peripheral area of ​​the lens produces a myopic defocus correction for the peripheral vision of the eye, achieving clear vision in the central part and myopic defocus in the peripheral part, which not only ensures the clear vision of teenagers under heavy academic workload, but also takes into account the function of delaying the deepening of myopia in the lens.

[0019] 2. The compensation values ​​at each optical power compensation reference point on the upper, lower, left and right sides of the lens periphery are compensated according to the actual measured values ​​of the relative peripheral hyperopic defocus (RPRE value) of the myopic eye by an open focal meter, which can achieve more accurate myopic defocus compensation function at each position. In the current situation where the myopic defocus margin of myopic defocus lenses is not large due to astigmatism factors, this precise compensation value distribution can undoubtedly better guarantee the myopic defocus function in all directions, and there is sufficient correction compensation in actual applications.

[0020] 3. The increase in the amount of lens astigmatism defocus is an important reason that affects the wearing comfort of myopic defocus lenses. The compensation value set in the lens provided by the present invention is 105% to 120% of the peripheral hyperopic defocus measurement value. It fully considers that under the current design and processing conditions of continuous surface myopic defocus lenses, the increase in synchronous astigmatism caused by the increase in compensation value may cause an increase in the lens wearing discomfort rate, and selects an appropriate ratio of compensation value to the measurement value. At the same time, it takes into account the functionality of the lens' peripheral myopic defocus and the wearer's compliance, and can better play the role of the lens in preventing and controlling the deepening of myopia.

[0021] 4. The peripheral myopia defocus compensation value of the lens is designed to be between 105% and 120% of the peripheral hyperopia defocus value of myopic patients. The fluctuation of the compensation value is to achieve a basically uniform acceleration change of the peripheral myopia defocus compensation value of the lens from the center of the macula to the near axis and the far axis, which is in line with the measurement data rules of the existing open-type focal meter on the naked eye peripheral vision of myopic eyes, and also meets the requirements of the human eye for lens wearing comfort.

[0022] 5. The lens takes into account the difference in the actual peripheral defocus caused by the inward rotation of the eyeball when using the eye at close range. The reference point of the near vision zone of the lens has an inward deviation of 1 mm toward the nose at a 10-degree viewing angle, and the reference point of the near vision zone of the lens has an inward deviation of 2 mm toward the nose at a 20-degree viewing angle, so that the wearing comfort is better when reading and looking at close range.

[0023] 6. The prism compensation value is designed with the influence of lens tilt in mind. The wearer will obtain the real customer-perceived degree instead of the degree measured by ordinary lens instruments. This greatly reduces the aberration interference caused by the actual wearing position of the frame glasses, so that the implementation of the lens functionality is further effectively guaranteed. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a schematic diagram of naked eye peripheral hyperopic defocus imaging;

[0025] Figure 2 It is a schematic diagram of the prior art in which the lenses of the glasses are vertically tilted after the wearer puts on the glasses;

[0026] Figure 3 It is a schematic diagram of the prior art in which the lenses of the glasses are tilted horizontally after the wearer puts on the glasses;

[0027] Figure 4 A schematic diagram of the effect of a personalized peripheral myopic defocus imaging principle provided by the present invention;

[0028] Figure 5 A schematic diagram of the positions of reference points for optical power compensation on a personalized peripheral myopia defocus spectacle lens provided by an embodiment of the present invention;

[0029] Figure 6 The optical power distribution diagram of the initial peripheral myopic defocus eyeglass lens provided in Example 1 of the present invention;

[0030] Figure 7 A myopic defocus distance diagram imaged on the longitudinal meridian of the peripheral myopic defocus spectacle lens provided in Example 1 of the present invention;

[0031] Figure 8 A myopic defocus distance diagram imaged on a horizontal line through the peripheral myopic defocus spectacle lens provided in Example 1 of the present invention;

[0032] Fig. 9 A power distribution diagram of a peripheral myopic defocus eyeglass lens provided in Example 2 of the present invention;

[0033] Fig.10 A myopic defocus distance diagram of the image formed on the longitudinal meridian of the peripheral myopic defocus spectacle lens provided in Example 2 of the present invention;

[0034] Fig.11 A myopic defocus distance diagram imaged on a horizontal line through a peripheral myopic defocus spectacle lens provided in Example 2 of the present invention;

[0035] Fig.12 A power distribution diagram of a peripheral myopic defocus eyeglass lens provided in Example 3 of the present invention;

[0036] Fig.13 A myopic defocus distance diagram imaged on the longitudinal meridian of the peripheral myopic defocus spectacle lens provided in Example 3 of the present invention;

[0037] Fig.14 A myopic defocus distance diagram imaged on a horizontal line through a peripheral myopic defocus spectacle lens provided in Example 3 of the present invention;

[0038] In the figure, 1. The fovea of ​​the retina; 2. Light emitted by objects in the central field of view; 3, 4. Light emitted by off-axis objects; 5. Myopic defocus lenses worn; 6. Objects in the field of view. DETAILED DESCRIPTION

[0039] The technical solution of the present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0040] Example 1

[0041] This embodiment takes the right eye of a patient with ametropia with a myopia degree of -2D as an example to provide a peripheral myopic defocus spectacle lens with a personalized design, wherein the outer (front) surface is a spherical surface and the inner (back) surface is an asymmetric toroidal surface. The design method of the inner surface is as follows:

[0042] The peripheral hyperopic refractive power defocus values ​​of the patient's naked eye at 10, 20, and 30 degrees on the nasal side, 10, 20, and 30 degrees on the temporal side, 10, 20, and 30 degrees on the upper far vision, and 10, 20 degrees on the lower near vision are measured by an open focal meter, as shown in the first column of Table 1, "Naked eye hyperopic defocus value (D)", where D is the unit symbol of diopter. It shows that the hyperopic defocus increases significantly with the increase of the viewing angle, and the temporal side is greater than the nasal side, and the far vision area is slightly greater than the near vision area. In addition to being able to correct the central field of vision, the designed lens must also be able to correct the peripheral field of vision. It is necessary to gradually reduce the myopia from the center of the lens, that is, there must be asymmetric positive focal compensation up and down and left and right, the compensation on the nasal side is less than the compensation on the temporal side, and the compensation in the near vision area is slightly less than that in the far vision area.

[0043] At the same time, according to the frame selected by the patient, the upper part of the eyeglass lens is tilted outward by 9°, the right half of the lens (temporal side) is tilted inward by 7°, and the distance between the lens and the eye is 12.5 mm. The refractive index of the lens material to be designed is selected to be 1.597, the front surface focal power is 4.0D, the radius of curvature is 149.2 mm, the lens thickness is 1.2 mm, and the back surface spherical focal power is 6.0D.

[0044] Usually the rotation center of myopia is 14.5 mm behind the cornea, plus the lens-eye distance of 12.5 mm, and the distance from the eye rotation center to the lens center is 27 mm. The intersection position of the line of sight and the lens in each viewing angle direction of the myopia patient is calculated, which is a total of 10 focal compensation reference points on the lens, including the nasal side, temporal side, far vision, and near vision. Among them, the point corresponding to 10 degrees of near vision is 1 mm inward to the nasal side, and the point corresponding to 20 degrees of viewing angle is 2 mm inward to the nasal side; see the attached Figure 5 , which is a schematic diagram of the position of the power compensation reference points on a personalized peripheral myopic defocus eyeglass lens provided in this embodiment; the distance from each reference point position to the center of the lens is shown in the second column of Table 1 "Lens reference point position (mm)". The power compensation value of each power compensation reference point is based on the naked eye hyperopic defocus measurement value. Considering that the myopic lens will further increase the hyperopic defocus for off-axis objects in the peripheral field of view, and it increases with the increase of the field of view angle, the designed compensation value is 105% to 120% of the naked eye hyperopic defocus measurement value, and the reference point farther from the center of the lens has a larger compensation percentage. The selection of the percentage must also ensure that the power compensation value maintains a basically uniform acceleration change from the central field of view to the near-axis and far-axis fields of view. The power compensation value of each power compensation reference point is shown in the third column of Table 1 "Lens power compensation value (D)". The power compensation is achieved by aspheric design and the addition of an asymmetric toroidal correction vector height to obtain the initial lens vector height. See Attachment Figure 6 , which is the optical power distribution diagram of the initial peripheral myopic defocus lens provided in this embodiment.

[0045] Based on the spectacle frame parameters measured above, the Emsley modified simplified eye model is used to perform ray tracing and off-axis beam imaging formula calculation on the initial lens to obtain the distance from the retina to the image of the central field of view object and the peripheral field of view off-axis object, see Appendix Figure 7 , is a myopic defocus distance diagram of the imaging on the longitudinal meridian of the peripheral myopic defocus spectacle lens provided in this embodiment; see the attached Figure 8 , which is a myopic defocus distance diagram imaged on a horizontal line through the peripheral myopic defocus spectacle lens provided in this embodiment; Figure 7 and Figure 8 The middle dotted curves represent the imaging of light on the longitudinal meridian and horizontal lines of the initial lens: the near-axis objects in the central field of view are imaged on the retina, and the off-axis objects outside the central field of view are imaged in front of the peripheral retina, showing myopic defocus, showing the effect of the lens after optical power compensation. The distance of the image from the retina is listed in the fourth column of Table 1, "Defocus distance before prism compensation (mm)" ("before prism compensation" refers to the "initial lens"), and the myopic defocus of the image formed in the direction with a large viewing angle is more obvious.

[0046] However, it can also be seen that due to the tilt of the lens, a prismatic effect occurs when light passes through the lens, and the image of the off-axis object in front of the retina is asymmetric with respect to the nasal and temporal sides, and between far vision and near vision. Therefore, a prism sagitta is added to the sagitta of the initial lens inner surface to further perform prism compensation on the lens, thereby obtaining a personalized designed sagitta of the peripheral myopic defocus lens. Figure 7 and Figure 8 The solid curves in the figure represent the imaging of the longitudinal meridian and horizontal lines of the lens after prism compensation. It can be seen that the asymmetry phenomenon has been improved after prism compensation, and the off-axis objects outside the central field of view are basically symmetrically imaged in front of the peripheral retina. The distance of the image from the retina is listed in the fifth column of Table 1, "Defocus distance after prism compensation (mm)".

[0047] Table 1

[0048] .

[0049] The obtained personalized peripheral myopia defocus spectacle lens sagitta is input into a free-form surface CNC machine tool, and the inner surface of the lens blank is cut to obtain the personalized peripheral myopia defocus spectacle lens.

[0050] Example 2

[0051] This embodiment takes the left eye of a patient with refractive error with myopia of -6.5D as an example to provide a personalized peripheral myopic defocus eyeglass lens, whose outer surface is a spherical surface and the inner surface is an asymmetric toroidal surface. The design and preparation method of the inner surface refer to Example 1.

[0052] In this embodiment, the peripheral hyperopic defocus values ​​at 10 degrees, 20 degrees, and 30 degrees on the nasal side of the patient's naked eye, 10 degrees, 20 degrees, and 30 degrees on the temporal side, 10 degrees and 20 degrees above for far vision, and 10 degrees and 20 degrees below for near vision are measured by an open focal meter, as listed in the first column of Table 2 "Naked eye hyperopic defocus values ​​(D)"; the positions of 10 optical power compensation reference points on the lens, including the nasal side, temporal side, far vision, and near vision, are calculated based on the distance of 27.5 mm from the center of rotation of the eye to the center of the lens, as shown in the second column of Table 2 "Lens reference point positions (mm)"; the optical power compensation values ​​of each optical power compensation reference point are shown in the third column of Table 2 "Lens optical power compensation value (D)", and the optical power distribution of the peripheral myopic defocus eyeglass lens that realizes optical power compensation through aspherical design and additional asymmetric hyper-torus surface correction vector height is as shown in Fig. 9 The upper part of the eyeglass lens is tilted outward by 9°, and the left half (temporal side) is tilted inward by 7°. The refractive index of the lens material is 1.597, the radius of curvature of the front surface is 597 mm, and the focal length is 1.0D; the central focal length of the back surface is 7.5D, and the central thickness of the lens is 1.2 mm.

[0053] By performing ray tracing and the off-axis fine beam imaging formula, we can obtain the distance from the retina to the image of the object in the central field of view and the off-axis object in the peripheral field of view. Fig.10 and Fig.11 As shown. It can also be seen that the lens provided in this embodiment presents myopic defocused imaging. The distance of the image formed without prism compensation from the retina is listed in the fourth column of Table 2 "Defocus distance before prism compensation (mm)", and the distance of the image formed by the lens after prism compensation from the retina is listed in the fifth column of Table 2 "Defocus distance after prism compensation (mm)".

[0054] Table 2

[0055] .

[0056] Example 3

[0057] This embodiment takes the right eye of a patient with refractive error whose myopia spherical power is -4D and astigmatism -2D axial 20 degrees as an example. Provide a personalized peripheral myopia defocus spectacle lens, whose outer surface is a spherical surface and whose inner surface is an asymmetric toroidal surface. The design and preparation method of the inner surface refer to Example 1.

[0058] In this embodiment, the peripheral hyperopic defocus values ​​of the patient's naked eye at 10 degrees, 20 degrees, and 30 degrees on the nasal side, 10 degrees, 20 degrees, and 30 degrees on the temporal side, 10 degrees and 20 degrees above for far vision, and 10 degrees and 20 degrees below for near vision are measured by an open focal meter, as listed in the first column of Table 3 "Naked eye hyperopic defocus values ​​(D)"; the positions of 10 optical power compensation reference points on the lens, including the nasal side, temporal side, far vision, and near vision, are calculated based on the distance of 27 mm from the center of rotation of the eye to the center of the lens, as shown in the second column of Table 3 "Lens reference point positions (mm)"; the optical power compensation values ​​of each optical power compensation reference point are shown in the third column of Table 3 "Lens optical power compensation values ​​(D)". The front surface of the lens is a spherical surface with a focal power of 2.5D. The focal power compensation is achieved by adding an asymmetric toroidal correction sagitta to the back surface spherical cylinder with a spherical power of 6.5D and a cylindrical power of 2D in the optical axis direction of 20 degrees. The focal power distribution of the peripheral myopic defocus eyeglass lens that achieves focal power compensation after the correction sagitta is as follows: Fig.12 By performing ray tracing and the off-axis fine beam imaging formula, we can obtain the distance from the retina to the image of the object in the central field of view and the off-axis object in the peripheral field of view. Fig.13 and Fig.14 As shown. It can also be seen that the lens provided in this embodiment presents myopic defocused imaging. The distance of the image formed without prism compensation from the retina is listed in the fourth column of Table 3 "Defocus distance before prism compensation (mm)", and the distance of the image formed by the lens after prism compensation from the retina is listed in the fifth column of Table 3 "Defocus distance after prism compensation (mm)".

[0059] Table 3

[0060] .

[0061] The peripheral myopic defocus spectacle lenses provided by the present invention have a spherical outer surface and a main design surface on the inner surface. Peripheral optical power compensation and prism compensation are both achieved by correcting the sagittal height of the inner surface of the lens, and are suitable for workshop processing of personalized lenses. The peripheral myopic defocus spectacle lenses provided by the present invention enable objects in the central field of view and the near-axis field of view to be imaged on the fovea of ​​the retina, and off-axis objects that deviate far from the central field of view are imaged in front of the retina, which can correct vision and correct peripheral hyperopic defocus to myopic defocus, inhibit the eyeball from stretching backward, and control the deepening of myopia. The optical power compensation values ​​in the four directions of the lens are different, which conforms to the ergonomic principle of reducing the amount of defocus of the eyeball inward rotation when using the eyes at close range, so that the myopic defocus image received by the peripheral retina is more uniform and symmetrical.

Claims

1. A method for designing a personalized peripheral myopic defocus spectacle lens, characterized in that The design of the inner surface of the lens includes the following steps: (1) Measure the emmetropia and myopia of myopic patients and the refractive power of the naked eye in each viewing angle direction, including 10 degrees, 20 degrees, and 30 degrees on the nasal side of the naked eye, 10 degrees, 20 degrees, and 30 degrees on the temporal side, 10 degrees and 20 degrees on the upper far vision, and 10 degrees and 20 degrees on the lower near vision. The difference between the measured refractive power in each viewing angle direction and the patient's emmetropia refractive power is the peripheral hyperopic defocus value of the myopic patient. (2) Determine the intersection of the line of sight and the lens at each viewing angle of the myopic patient. The point corresponding to 10 degrees of near vision is 1 mm inward to the nose, and the point corresponding to 20 degrees of near vision is 2 mm inward to the nose. The 10 positions obtained on the lens are used as the reference points for the optical power compensation of the lens design. (3) For each focal compensation reference point in step (2), 105% to 120% of the peripheral hyperopic defocus value of the myopic patient corresponding to step (1) is used as the focal compensation value, and an asymmetric peripheral focal compensation design is performed on the lens to obtain an initial lens sagittal height; (4) According to the parameters of the glasses frame to be worn by the myopic patient, the initial lens sagittal height is corrected by setting an additional prism to obtain a personalized peripheral myopic defocused eyeglass lens; Among them, the design method of the lens sagitta is that the outer surface of the lens is a spherical surface and the inner surface is an asymmetric hyper toroid; the optical power compensation design in step (3) is achieved by aspherical design and adding an asymmetric hyper toroid to correct the sagitta, so as to obtain the initial lens sagitta; the correction method in step (4) is to add a prism sagitta to the sagitta of the initial lens inner surface to further perform prism compensation on the lens, so as to obtain the sagitta of the peripheral myopic defocus eyeglass lens with a personalized design.

2. The method for designing a personalized peripheral myopic defocus eyeglass lens according to claim 1, characterized in that: The spectacle frame parameters include the lens-eye distance, the vertical tilt angle, and the horizontal tilt angle of the frame after the myopic patient wears the glasses.

3. The method for designing a personalized peripheral myopic defocus eyeglass lens according to claim 1, characterized in that: The additional prism has a vertical height difference of 3 to 5.5 mm and a horizontal height difference of 2.2 to 4.5 mm.

4. A personalized peripheral myopic defocus eyeglass lens obtained by the design method of claim 1.

5. The personalized peripheral myopic defocus eyeglass lens according to claim 4, characterized in that: The central optical power range of the lens obtained based on the emmetropia myopia of the myopic patient is -1.00D to -10.00D.

6. The method for preparing a personalized peripheral myopic defocused spectacle lens according to claim 4, characterized in that: The inner surface of the lens is machined in a lathe.

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