Partition peripheral out-of-focus lens with higher micro lens utilization rate

Abstract

The invention relates to the field of myopia prevention and control, and discloses a subarea peripheral defocus lens with a higher micro lens utilization rate, which comprises a base lens and a defocus functional area arranged on the front surface of the base lens: the defocus functional area comprises a nasal side area, a lower visual area, a bitamporal area, an upper visual area and a central defocus area; the absolute value relationship of the defocusing amount of the microlens arrays of the nasal side area, the lower visual area, the bitamporal area and the upper visual area is that the lower visual area > = the nasal side area > = the bitamporal area > = the upper visual area > = the bitamporal area, and the diameter relationship of the microlenses is that the bitamporal area > = the upper visual area > = the nasal side area > = the lower visual area. According to the invention, the sizes and the number of the lenses in different partitions are reasonably adjusted, and a denser microlens array effect is achieved while a smaller number of microlenses are used. The effective defocus area and the use efficiency of the micro lens are improved, the balance between visual definition and myopia prevention and control efficiency is achieved, and the processing cost is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of myopia prevention and control, and specifically to a zoned peripheral defocus lens with higher utilization rate of microlenses. Background Art

[0002] The background of peripheral defocus technology stems from a breakthrough discovery of the relationship between the peripheral refractive state of the retina and the development of myopia. In the early 2000s, research confirmed that although traditional single-vision lenses correct central vision, they cause peripheral light to focus behind the retina (hyperopic defocus), forming a signal that promotes the growth of the eye axis and exacerbating the progression of myopia. Based on this, scientists proposed the "peripheral defocus theory", that is, by optical design, peripheral light can be focused in front of the retina (myopic defocus), which can effectively inhibit the excessive elongation of the eye axis. With the inspiration of corneal reshaping lenses (OK lenses) and the breakthrough of microlens technology, frame-type peripheral defocus lenses (such as Hoya MyoVision, Essilor Stellest) came into being. They adopt a multi-point or annular microlens design, forming a dynamic defocus area while correcting central vision. Clinical data shows that they can slow down myopia progression by more than 60%, and now they have become the mainstream non-invasive solution for adolescent myopia prevention and control.

[0003] Existing peripheral defocus lenses generally adopt an annular symmetric microlens array design, which has significant defects in adapting to the human eye visual field: First, the refractive distribution of the human retina is asymmetric, and the difference in defocus-sensitive areas between the temporal and nasal sides caused by the eccentric distance of the eye axis (clinical data shows that the defocus response intensity on the temporal side is 37% higher than that on the nasal side), while the current symmetric uniform arrangement cannot achieve regional defocus amount adaptation; Second, the traditional design overstacks microlenses in pursuit of defocus coverage rate, resulting in microlens units at the edge of the lens being in the low-response area of the retina, with insufficient actual optical utilization rate; Third, the process tolerance rate of the microlens array is negatively correlated with the number of units. Excessive increase in the number of microlenses will not only reduce the qualified rate of injection molding, but also increase costs, severely restricting the product penetration rate. Therefore, it is necessary to design a five-zone peripheral defocus lens with a trapezoidal arrangement to solve the above technical problems. Summary of the Invention

[0004] Aiming at the deficiencies of the prior art, the present invention provides a zoned peripheral defocus lens with higher utilization rate of microlenses, which solves the problems in the prior art.

[0005] To achieve the above objectives, the present invention is realized through the following technical solutions:

[0006] A segmented peripheral defocus lens with a higher micro-lens utilization rate, which is composed of a base lens and a defocus functional area processed thereon. The defocus functional area includes: a nasal area, a downward visual area, a temporal area, and an upward visual area. The absolute value relationship of the defocus amounts of the micro-lens arrays in the four functional areas satisfies: downward visual area ≥ nasal area ≥ temporal area ≥ upward visual area. The number of micro-lens arrays in the four functional areas: downward visual area ≥ nasal area ≥ upward visual area ≥ temporal area. The diameters of the micro-lenses in the four functional areas: temporal area ≥ upward visual area ≥ nasal area ≥ downward visual area.

[0007] The diameter of the micro-lenses in the nasal area is 0.05 mm - 1 mm, the defocus amount is 2.5 D - 4 D, and they are distributed in the range of 60° - 90° of the nasal visual field, with the number of micro-lenses being 81 - 100. The diameter of the micro-lenses in the downward visual area is 0.07 mm - 1.25 mm, the defocus amount is 3 D - 4.5 D, and they are distributed in the range of 60° - 90° of the lower visual field side, with the number of micro-lenses being 90 - 120. The diameter of the micro-lenses in the temporal area is 1 mm - 2 mm, the defocus amount is 2 D - 3 D, and they are distributed in the range of 60° - 90° of the temporal visual field side, with the number of micro-lenses being 50 - 60. The diameter of the micro-lenses in the upward visual area is 1 mm - 2 mm, the defocus amount is 2 D - 3 D, and they are distributed in the range of 60° - 90° of the upper visual field side, with the number of micro-lenses being 70 - 90.

[0008] The diameter of the micro-lenses in the central defocus area is 0.05 mm - 1 mm, the defocus amount is 1 - 2 D, and the number of micro-lenses is 10 - 16, which are annularly distributed on a circle with a diameter of 6 - 9 mm. The micro-lenses in the four segmented areas, namely the nasal area, the downward visual area, the temporal area, and the upward visual area, are all cylindrical, with a spherical surface, and the material is the same as that of the base lens, and the thickness is 0.01 mm. The diopter of the base lens is -10 D - 0 D, the front surface is spherical, the rear surface is aspherical, and the diameter is 80 mm. The four segmented micro-lenses are all distributed in an isosceles trapezoid, with the short side of the trapezoid close to the center, and the number of lenses gradually increases from the inside to the outside.

[0009] The four functional partitions of the nasal, lower, temporal, and upper sides show different characteristics in the setting of defocus parameters. Research data shows that there is a refractive power difference of +0.83 D in the temporal region of the human eye retina compared to the nasal side. Therefore, a relatively small defocus amount design is adopted in this region, and the diameter of the micro-lenses is increased to reduce the number of lenses used. The downward visual area, as the main area for near vision, is configured with a larger defocus amount and the lens size is reduced to ensure the defocus amount while improving the comfort of viewing near objects. The upper side, the far vision area, adopts the smallest defocus amount design to avoid interfering with the clarity of distant vision. The central area defocus ring effectively enhances the efficacy of myopia prevention and control. The trapezoidal arrangement breaks through the limitation of the traditional concentric circle arrangement, improves the micro-lens filling rate and utilization rate, and realizes a denser defocus signal coverage in the same area.

[0010] The present invention provides a segmented peripheral defocus lens with a higher micro-lens utilization rate. It has the following beneficial effects:

[0011] 1. Through a new arrangement method, the present invention reasonably adjusts the sizes and quantities of lenses in different zones. While using fewer microlenses, it achieves a denser microlens array effect. It improves the effective defocus area and utilization efficiency of microlenses, achieves a balance between visual clarity and myopia prevention and control efficacy, reduces processing costs, and the zonal design adapts to the diopter distribution of the human eye retina. The defocus ring in the central area makes the myopia control effect better.

[0012] 2. After slicing, the effective utilization rate of the microlenses in the present invention can still remain at a relatively high level. Compared with the current peripheral defocus glasses on the market, although other peripheral defocus products use a larger number of microlenses, the effective utilization probability of the microlenses after actual slicing is greatly reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 Structural diagram of the present invention;

[0014] Figure 2 Effective area of the lens slice of the present invention;

[0015] Figure 3 Effect diagram after slicing of the present invention;

[0016] Figure 4 Structural diagram of a traditional peripheral defocus lens;

[0017] Figure 5 Effective area of the slice of the traditional peripheral defocus lens;

[0018] Figure 6 Effect diagram after slicing of the traditional peripheral defocus lens;

[0019] Figure 7 Imaging diagram for zonal design verification;

[0020] Figure 8 Partially enlarged imaging diagram for zonal design verification;

[0021] Figure 9 Optical trace diagram for zonal design verification.

[0022] Among them, 1. Base lens; 2. Central defocus area; 3. Nasal side area; 4. Lower visual area; 5. Temporal side area; 6. Upper visual area. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0023] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0024] An embodiment of the present invention provides a zoned peripheral defocus lens with a higher utilization rate of microlenses. Please refer to the attached Figure 1 - attached Figure 9 .

[0025] Experiment 1:

[0026] I. Sample preparation

[0027] Lens selection:

[0028] Select 5 pieces each of the defocus lens of the present invention and commercially available products (Hoya MyoVision, Essilor Stellest, Zeiss LittlePilots, Moonlight EasyControl, Aura), and ensure that the base curve, diopter (-3.00D), and central thickness (1.2 mm ± 0.1 mm) are the same.

[0029] Mark the optical centers of all lenses, remove the edge chamfers, and retain the original functional area distribution.

[0030] Standardized cutting:

[0031] Use a numerically controlled precision cutting machine to cut out a circular sample with a diameter of 30 mm (including all functional areas) along the horizontal axis of the optical center of the lens.

[0032] Polish the edges of the cut samples to eliminate burr interference.

[0033] II. Measurement of lens diameter and functional area

[0034] Measurement of the total lens diameter:

[0035] Use a non-contact optical profiler (Keyence VR-3200) to measure the actual diameter of the cut samples in a constant temperature environment of 25°C, and repeat 3 times to take the average value.

[0036] Determination of the functional area:

[0037] Adopt the fluorescence staining method: Immerse the samples in 0.1% rhodamine B solution for 10 seconds, and observe the functional area boundary under ultraviolet light after rinsing.

[0038] Use a high-resolution CCD camera (resolution 5 μm / pixel) to take pictures of the stained areas, and calculate the area of each partition (nasal side, downward view, temporal side, upward view, and central defocus area) through ImageJ software.

[0039] III. Statistics of microlens parameters

[0040] Number and distribution density of microlenses:

[0041] Use a laser confocal microscope (Olympus LEXT OLS5000, 50× objective lens) to take 10 non-overlapping field-of-view images of each functional area partition.

[0042] Use the AI image analysis software (Halcon) to automatically identify the micro-lens contour, count the number of micro-lenses in a single field of view, and estimate the total number (formula: total number = average number in a single field of view × total number of fields of view).

[0043] Measurement of micro-lens diameter:

[0044] Randomly select 100 micro-lenses from the confocal images, measure the diameter of their maximum circumscribed circles, and calculate the average value and standard deviation.

[0045] IV. Evaluation of the effective utilization rate of micro-lenses

[0046] Calculation of the defocus signal coverage rate:

[0047] Use the scanning function of the white light interferometer (Zygo NewView 9000) to scan the surface topography of the functional area and generate a 3D height map.

[0048] Define the effective defocus area: the area where the height difference ≥ 0.01 mm and the radius of curvature ≤ 10 mm.

[0049] Calculate the ratio of the effective defocus area to the total area of the functional area as the utilization rate index.

[0050] Analysis of the filling rate:

[0051] Based on the micro-lens position coordinate data (extracted by image analysis), calculate the average value of the ratio of the center distance between adjacent micro-lenses to the diameter to evaluate the arrangement compactness (target value: 1.2 - 1.5 times the diameter).

[0052] V. Experimental control conditions

[0053] Environmental control:

[0054] Constant temperature and humidity laboratory (25°C ± 1°C, humidity 50% ± 5%) to avoid the influence of temperature drift on optical measurements.

[0055] Equipment calibration:

[0056] All optical instruments are calibrated with NIST standard blocks (step height block, line width block) before daily use.

[0057] Data verification:

[0058] Each parameter measurement is independently completed by two operators. When the result difference > 5%, re-measurement is required.

[0059] The final measured data is shown in Table 1 below:

[0060]

[0061] As shown in Table 1, when comparing the current peripheral defocus glasses on the market, although other peripheral defocus products use a larger number of microlenses, the effective utilization probability of microlenses is greatly reduced after actual slicing. The effective utilization rate of microlenses in the present invention can still remain at a high level after slicing.

[0062] Comparing Figure 1 and Figure 4 , through a new arrangement method, the present invention reasonably adjusts the size and number of lenses in different zones. While using fewer microlenses, it achieves a denser microlens array effect. Comparing Figures 2, 3, 4, and 5, the invention improves the effective defocus area and utilization efficiency of microlenses (the effective utilization rate can reach 94.7%), achieves a balance between visual clarity and myopia prevention and control efficacy, and reduces processing costs. The zonal design adapts to the refractive power distribution of the human eye retina, and the defocus ring in the central area makes the myopia control effect better.

[0063] The formula for the effective utilization rate of microlenses is:

[0064]

[0065] As Figure 7 Figure 8 in the imaging result, after the light passes through a single microlens in four zones and forms an image, the relationship of their focal lengths is: upper visual zone 6 > temporal zone 5 > nasal zone 3 > lower visual zone 4. The larger the defocus amount, the larger the spot radius of the light trace diagram when it forms an image on the retina. From Figure 9 the light trace diagram, the imaging spot size in the lower visual zone is the largest, followed by the imaging spot size in the nasal side. Similarly, analyzing the spots in other zones, the relationship of the defocus amounts in the four zones can be obtained as lower visual zone 4 > nasal zone 3 > temporal zone 5 > upper visual zone 6.

[0066] The optical and anatomical asymmetry in the horizontal direction of the eyeball, the overcorrection of the nasal side in traditional lens design, the biological regulation differences in the peripheral refractive state of the retina, and the superimposed effects of daily eye use behaviors. In response to this phenomenon, modern myopia prevention and control technologies (personalized defocus lenses, corneal reshaping lenses) strive to balance the nasal-temporal defocus difference through asymmetric optical design, thereby more effectively controlling the progression of myopia.

[0067] According to the reciprocal relationship between the degree and the focal length (unit: m), if a microlens with a defocus of 400 degrees is required, its diopter is 4.00D, and its focal length is 1 / 4 m, that is, 250 mm. According to the relationship formula between the focal length and the radius of curvature (where f is the focal length of the lens, R 1 rear surface focal length, R 2 is the radius of curvature of the front surface, and n is the refractive index of the lens):

[0068] f = R 1 R 2 / [(n - 1)(R 1 - R2 )]

[0069] The rear surface R of the microlens here 2 is equal to the radius of curvature of the front surface of the substrate lens. Substituting R 2 = 800, and substituting the refractive index n of the substrate lens material, we get R1 = 111.235 mm.

[0070] The specific parameters of the microlens are shown in the following table:

[0071]

[0072]

[0073] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A partitioned peripheral defocus lens with higher microlens utilization, characterized in that: It comprises a base lens (1) and a defocusing functional area arranged on the front surface thereof: The defocus functional area comprises a nasal area (3), a lower viewing area (4), a temporal area (5), an upper viewing area (6) and a central defocus area (2). The absolute value relationship of the defocus amount of the microlens array of the nasal area (3), the lower viewing area (4), the temporal area (5) and the upper viewing area (6) is: The inferior visual area (4) ≥ the nasal area (3) ≥ the temporal area (5) ≥ the superior visual area (6), and the relationship of the number of microlenses is the inferior visual area (4) ≥ the nasal area (3) ≥ the superior visual area (6) ≥ the temporal area (5); The relationship between the diameters of the microlenses is as follows: temporal area (5) ≥ superior visual area (6) ≥ nasal area (3) ≥ inferior visual area (4). The microlenses in each area are arranged in an isosceles trapezoid, with the short side of the trapezoid close to the center of the lens. The number of microlenses increases gradually from the inside to the outside.

2. The partitioned peripheral defocusing lens with higher microlens utilization rate according to claim 1, characterized in that: The absolute value of the defocus of the microlens in the nasal area (3) is 2.5D-4D, the diameter of the microlens is 0.05mm-1mm, and the microlens is distributed in the nasal visual field range of 60°-90°. The number of microlenses is 81-100.

3. The partitioned peripheral defocusing lens with higher microlens utilization rate according to claim 1, characterized in that: The absolute value of the defocus of the microlens in the lower viewing area (4) is 3D-4.5D, the diameter of the microlens is 0.07mm-1.25mm, and the microlenses are distributed in the range of 60°-90° in the lower visual field. The number of microlenses is 90-120.

4. The partitioned peripheral defocusing lens with higher microlens utilization rate according to claim 1, characterized in that: The absolute value of the defocus amount of the microlens in the temporal area (5) is 2D-3D, the diameter of the microlens is 1mm-2mm, and the microlens is distributed in the range of 60°-90° of the temporal visual field, and the number of the microlenses is 50-60.

5. The partitioned peripheral defocusing lens with higher microlens utilization rate according to claim 1, characterized in that: The absolute value of the defocus amount of the microlens in the upper viewing area (6) is 2D-3D, the diameter of the microlens is 1mm-2mm, and the microlenses are distributed in the range of 60°-90° in the upper visual field, and the number of the microlenses is 70-90.

6. The partitioned peripheral defocusing lens with higher microlens utilization rate according to claim 1, characterized in that: The absolute value of the defocus amount of the microlens in the central defocus area (2) is 1D-2D, the diameter of the microlens is 0.05mm-1mm, the number of the microlenses is 10-16, and they are arranged in a ring shape on a circle with a diameter of 6-9mm.

7. The partitioned peripheral defocusing lens with higher microlens utilization rate according to claim 1, characterized in that: The refractive power of the base lens (1) is between -10D and 0D, its front surface is a spherical surface, its rear surface is an aspherical surface, and the diameter of the base lens (1) is 80 mm.

8. The partitioned peripheral defocusing lens with higher microlens utilization rate according to claim 1, characterized in that: Each subarea microlens is a cylindrical structure with a spherical surface, made of the same material as the base lens (1), and has a thickness of 0.01 mm.

9. The partitioned peripheral defocusing lens with higher microlens utilization rate according to claim 1, characterized in that: In the isosceles trapezoidal arrangement of the nasal area (3), the lower viewing area (4), the temporal area (5), and the upper viewing area (6), the angle between the long sides of adjacent trapezoids is 60°-90°, and the coverage area of ​​each partitioned microlens accounts for more than 80% of the corresponding visual field area.

10. The partitioned peripheral defocusing lens with higher microlens utilization rate according to claim 1, characterized in that: The total number of microlenses in the defocusing functional area is 210-280, the filling rate is greater than 90%, and the center spacing of each subarea microlens is 1.2-1.5 times the diameter of the corresponding microlens.

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