Micro-lens array composite super-structure contact lens and preparation method thereof

Abstract

The invention belongs to the technical field of vision correction contact lenses, and particularly relates to a micro-lens array composite super-structure contact lens and a preparation method thereof. The device comprises: a lens body, one side of the concave surface of which is provided with an out-of-focus surface; wherein the convex surface of the lens body is provided with a light splitting structure and a zooming structure, the zooming structure is located at the edge of the lens body, and the light splitting structure is located at one side of the zooming structure; and the zoom structure is suitable for adjusting the refractive index of the edge of the lens body, so that the focal point at the edge of the lens body and the focal point at the center of the lens body fall on a defocus plane. The light splitting structure is suitable for separating the passing light into red light and blue light, so that the focus of the red light falls on a defocus plane. Through the arrangement, bifocus control and wavelength selective focusing are realized, therapeutic defocusing is combined with light regulation and control, and the problem that multiple devices need to be matched in the prior art is solved.

Description

Technical Field

[0001] The present invention belongs to the technical field of vision - correcting contact lenses, and particularly relates to a microlens - array composite metasurface contact lens and a preparation method thereof. Background Art

[0002] At present, both daily - worn glasses and contact lenses have experienced remarkable development and have reached a certain degree of maturity in the fields of materials and processing processes. However, in the field of optical design of both, they are still based on geometric optics and still mainly aim at vision correction, with a single function. When further realizing composite functions, such as visual therapy and eye protection functions, it is usually necessary to replace the product or wear more devices to achieve the effect of composite functions. Carrying multiple devices leads to an increase in their volume, and the cumbersome switching process results in a decrease in people's willingness to wear, thus making it difficult to achieve the treatment goal satisfactorily.

[0003] Therefore, there is an urgent need to design a microlens - array composite metasurface contact lens and a preparation method thereof to solve the technical problem that the optical structure of contact lenses is simple, with a single function, and cannot achieve a satisfactory vision treatment goal.

[0004] It should be noted that the above - disclosed information in this background - art section is only used to understand the background art of the concept of this application, and therefore, it may include information that does not constitute prior art. Summary of the Invention

[0005] The embodiments of the present disclosure at least provide a microlens - array composite metasurface contact lens and a preparation method thereof.

[0006] In a first aspect, the embodiments of the present disclosure provide a microlens - array composite metasurface contact lens, including: a lens body, one concave side of which has a defocus surface;

[0007] Wherein, the convex surface of the lens body has a light - splitting structure and a zoom structure, the zoom structure is located at the edge of the lens body, and the light - splitting structure is located on one side of the zoom structure;

[0008] And, the zoom structure is adapted to adjust the refractive index at the edge of the lens body so that the focal points at the edge of the lens body and the focal point at the center of the lens body both fall on the defocus surface;

[0009] The light - splitting structure is adapted to separate the incident light into red light and blue light so that the red light is focused on the defocus surface.

[0010] In an optional embodiment, the zoom structure includes a plurality of microlenses;

[0011] The microlens array is arranged.

[0012] In an optional embodiment, the light - splitting structure includes a plurality of gratings;

[0013] The gratings are arranged in sequence along the width direction.

[0014] In a second aspect, an embodiment of the present disclosure further provides a microlens array composite metasurface contact lens, including: a lens body, one concave side of which has a defocus surface;

[0015] Wherein, the convex surface of the lens body has a plurality of light splitting structures and zoom structures, the zoom structures are located at the edge of the lens body, and the light splitting structures are located on one side of the zoom structures;

[0016] The light splitting structures and the zoom structures are arranged alternately in sequence;

[0017] And, the zoom structures are adapted to adjust the refractive index at the edge of the lens body so that the focal points at the edge of the lens body and the focal point at the center of the lens body both fall on the defocus surface;

[0018] The light splitting structures are adapted to separate the passing light into red light and blue light so that the red light is focused on the defocus surface.

[0019] In an optional implementation manner, the light splitting structures and the zoom structures are distributed along the circumferential direction and are connected end to end to form a ring.

[0020] In a third aspect, an embodiment of the present disclosure further provides a microlens array composite metasurface contact lens, including: a lens body, one concave side of which has a defocus surface;

[0021] Wherein, the convex surface of the lens body has a plurality of correction rings, the correction rings include light splitting structures and zoom structures, and the light splitting structures and the zoom structures are arranged alternately in sequence;

[0022] And, the zoom structures are adapted to adjust the refractive index at the edge of the lens body so that the focal points at the edge of the lens body and the focal point at the center of the lens body both fall on the defocus surface;

[0023] The light splitting structures are adapted to separate the passing light into red light and blue light so that the red light is focused on the defocus surface.

[0024] In an optional implementation manner, the correction rings are coaxially arranged, and the axes thereof coincide with the axis of the lens body.

[0025] In a fourth aspect, an embodiment of the present disclosure further provides a preparation method of a microlens array composite metasurface contact lens, which is applied to prepare the microlens array composite metasurface contact lens as described above, and the preparation method includes the following steps:

[0026] Step S1, preparing lens material: preparing an unhydrated soft material with high oxygen permeability;

[0027] Step S2, rough machining of the outer shape: Use a high-precision five-axis machining machine to perform preliminary rough machining of the customized microlens array and metasurface to the micron level to form a lens body;

[0028] Step S3, finish machining of the outer shape: Use a single-crystal diamond machining of an ultra-precision lathe and combine it with a self-developed pendulum tool holder to machine the customized microlens array and metasurface on a free-form surface to the nanometer level to form a beam splitting structure and a zoom structure;

[0029] Step S4, lens hydration: Place the machined lens in pure water for hydration to soften the lens and increase the water content.

[0030] In a fifth aspect, the embodiments of the present disclosure further provide a method for preparing a microlens array composite metasurface contact lens, which is applied to prepare the microlens array composite metasurface contact lens as described above, and the preparation method includes the following steps:

[0031] Step S1, prepare mold materials: Prepare high-quality phosphor bronze as the mold for single-crystal diamond machining of an ultra-precision lathe;

[0032] Step S2, prepare lens materials: Prepare an unhydrated soft material with high oxygen permeability;

[0033] Step S3, rough machining of the outer shape: Use a high-precision five-axis machining machine to perform preliminary rough machining of the customized microlens array and metasurface to the micron level to form a lens body;

[0034] Step S4, finish machining of the outer shape: Use a single-crystal diamond machining of an ultra-precision lathe and combine it with a self-developed pendulum tool holder to machine the customized microlens array and metasurface on a free-form surface to the nanometer level to form a beam splitting structure and a zoom structure;

[0035] Step S5, injection molding: Inject and mold the contact lens material through an ultra-precision mold;

[0036] Step S6, lens hydration: Place the machined lens in pure water for hydration to soften the lens and increase the water content.

[0037] The beneficial effects of the present invention are that the present invention adjusts the edge refractive index through a zoom mechanism, so that both the edge and the central focus fall on the defocus plane, and combines a beam splitting mechanism to separate red light and blue light, so that the red light focus accurately falls on the defocus plane, realizing dual focus control and wavelength-selective focusing, combining therapeutic defocus and light regulation, solving the problem of the need for multiple devices to cooperate in the related art, and significantly improving the functional complexity.

[0038] Other features and advantages of the present invention will be set forth in the following description, and in part will be obvious from the description, or may be learned by practice of the present invention. The objectives and other advantages of the present invention are realized and attained by the structure particularly pointed out in the specification, claims as well as the drawings.

[0039] In order to make the above objects, features and advantages of the present invention more comprehensible, the following specific preferred embodiments are given, and in conjunction with the accompanying drawings, detailed descriptions are as follows. Description of the Drawings

[0040] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for the description of the specific embodiments or the prior art. Obviously, the following drawings are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0041] Figure 1 Schematic diagram of the first morphological structure of a lens body provided by an embodiment of the present disclosure;

[0042] Figure 2 Schematic diagram of the second morphological structure of a lens body provided by an embodiment of the present disclosure;

[0043] Figure 3 Schematic diagram of the optical path structure of a lens body provided by an embodiment of the present disclosure;

[0044] Figure 4 First preparation flow chart of a microlens array composite metasurface contact lens provided by an embodiment of the present disclosure;

[0045] Figure 5 Second preparation flow chart of a microlens array composite metasurface contact lens provided by an embodiment of the present disclosure.

[0046] In the figure:

[0047] 1. Lens body; 2. Defocus plane; 3. Beam splitting structure; 4. Zoom structure; 5. Correction ring;

[0048] 6. Central light path; 61. Red light path; 62. Blue light path; 63. Defocus path;

[0049] 7. Retina. Detailed Embodiments

[0050] To make the objectives, technical solutions, and advantages of the embodiments of the present disclosure clearer, the technical solutions of the embodiments of the present disclosure will be clearly and completely described below with reference to the accompanying drawings. Apparently, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the scope of protection of the present invention.

[0051] Through research, it has been found that currently, both daily-worn glasses and contact lenses have undergone remarkable development and have reached a certain level of maturity in the fields of materials and processing technologies. However, in the field of optical design, both are still based on geometric optics and mainly aim at vision correction, with a single function. To further achieve composite functions, such as visual therapy and eye protection, it is usually necessary to replace the product or wear more devices to achieve the effect of composite functions. Carrying multiple devices increases their volume, and the cumbersome switching process reduces people's willingness to wear them, making it difficult to fully achieve the treatment goal.

[0052] However, when it comes to the group of people who hope to wear contact lenses, there is no suitable solution to meet the needs of this group. At the same time, in order to change the focal point position of multi-point defocus, the curvature of this micro-lens will be much smaller than the reference curvature, that is to say, the surface itself will appear extremely uneven, resulting in a significant reduction in the wearer's willingness to wear. In addition, the reduced overall size also further reduces the number of lenses that can be placed, leading to a decline in the treatment effect.

[0053] Regarding the defects existing in the above solutions, they are all the results obtained by the inventor through practice and careful research. Therefore, the process of discovering the above problems and the solutions proposed by the present disclosure below for the above problems should be the contributions made by the inventor to the present disclosure during the process of the present disclosure.

[0054] The following will describe in detail some embodiments of the present invention with reference to the accompanying drawings. Without conflict, the following embodiments and the features in the embodiments can be combined with each other. In addition, in the drawings, to effectively describe the technical content, the thickness of components can be exaggerated or reduced.

[0055] It should be noted that similar reference numerals and letters denote similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0056] Based on the above research, with reference to Figure 3, embodiments of the present disclosure provide a microlens array composite metamaterial contact lens, including: a lens body 1, with a defocus surface 2 on its concave side. The convex side of the lens body 1 has a light splitting structure 3 and a zoom structure 4. The zoom structure 4 is located at the edge of the lens body 1, and the light splitting structure 3 is located on one side of the zoom structure 4; and, the zoom structure 4 is adapted to adjust the refractive index at the edge of the lens body 1 so that the focal points at the edge of the lens body 1 and the focal point at the center of the lens body 1 both fall on the defocus surface 2; the light splitting structure 3 is adapted to separate the incident light into red light and blue light so that the focal point of the red light falls on the defocus surface 2.

[0057] Referring to Figure 3 , in at least one embodiment, assume that the lens body 1 is worn on the eyeball at this time. There is an assumed retina 7 position on the concave side of the lens body 1, and there is also a defocus surface 2 on the concave side of the lens body 1. The right vertex of the defocus surface 2 coincides with the right vertex of the retina 7, and the curvature of the defocus surface 2 is greater than the curvature of the retina 7. The light passing through the center part of the lens body 1 is focused on the defocus surface 2 and the right vertex of the retina 7 along the central optical path 6. The red light after being separated by the grating is focused on the defocus surface 2 and the right vertex of the retina 7 along the red light path 61. The blue light after being separated by the grating is focused between the lens body 1 and the defocus surface 2 along the blue light path 62. The light passing through the zoom structure 4 is focused on the defocus surface 2 along the defocus path 63.

[0058] Referring to Figure 1 , in at least one embodiment, the zoom structure 4 includes a number of microlenses. The zoom structure 4 is formed by arranging a microlens array at the edge of the lens body 1 so that the light at the edge of the lens body 1 passes through the microlenses and then passes through the lens body 1 to change the light path, making the light focus on the defocus surface 2. After setting the microlenses on the lens body 1, the focal length of the optical region around the microlenses is less than the focal length of the central optics, so as to focus in front of the retina to stimulate the eyeball and reduce the growth in the axial direction to achieve a therapeutic effect.

[0059] Referring to Figure 1 , in at least one embodiment, the light splitting structure 3 includes a number of gratings, which are arranged in sequence along the width direction. By setting the gratings on the lens, the red light and the blue light are separated, so that the red light is focused on the defocus surface 2, while the blue light is focused between the lens body 1 and the defocus surface 2.

[0060] It should be noted that for people with myopia, the eyes grow too long. When viewing a distant image, the red color is usually focused better on the retina than the blue color. Over time, if the red color is focused better than the blue color, the brain will judge that the eyes have grown too much and their growth should be inhibited. On the contrary, if the blue color is focused better than the red color for a long time, then the brain will think that the growth rate of the eyes is accelerating.

[0061] Therefore, in order to combine the multi-point defocus treatment scheme and the treatment scheme for longitudinal chromatic aberration to achieve the functions of curved surface extended depth of field and adaptive control of the incident light wavelength. In at least one embodiment, by designing a grating and a microlens array on the lens body 1, the grating, as a diffraction element, can well separate incident light of different wavelengths, and can cause a large-angle deflection of light with a relatively small element volume, thereby inhibiting the growth of the eye axis to achieve a therapeutic effect.

[0062] Refer to Figure 1 , in at least one embodiment, the light splitting structure 3 and the zoom structure 4 are arranged alternately in sequence and are connected end to end to form a ring, so as to improve the circumferential separation of the lens body 1 and the uniformity of the refracted light.

[0063] Refer to Figure 2 , in at least one embodiment, the microlens array composite metamaterial contact lens includes: a lens body 1, the concave side of which has a defocus surface 2. The convex surface of the lens body 1 has a light splitting structure 3 and a zoom structure 4, the zoom structure 4 is located at the edge of the lens body 1, and the light splitting structure 3 is located on one side of the zoom structure 4; and, the zoom structure 4 is adapted to adjust the refractive index at the edge of the lens body 1 so that the focal points at the edge of the lens body 1 and the focal point at the center of the lens body 1 both fall on the defocus surface 2; the light splitting structure 3 is adapted to separate the incident light into red light and blue light so that the focal point of the red light falls on the defocus surface 2.

[0064] Refer to Figure 2 , in at least one embodiment, the zoom structure 4 includes a plurality of microlenses. By arranging a microlens array at the edge of the lens body 1 to form the zoom structure 4, the light at the edge of the lens body 1 passes through the microlenses and is refracted and then passes through the lens body 1 to change the path of the light, so that the light is focused on the defocus surface 2.

[0065] Refer to Figure 2 , in at least one embodiment, the light splitting structure 3 includes a plurality of gratings, and the gratings are arranged in sequence along the width direction. By arranging gratings on the lens, red light and blue light are separated, so that the red light is focused on the defocus surface 2, while the blue light is focused between the lens body 1 and the defocus surface 2.

[0066] Refer to Figure 2 , in at least one embodiment, the light splitting structure 3 and the zoom structure 4 are arranged alternately in sequence and are connected end to end to form a ring, so as to improve the circumferential separation of the lens body 1 and the uniformity of the refracted light.

[0067] Refer to Figure 2 , in at least one embodiment, the correction ring 5 is coaxially arranged, and the axes are all coincident with the axis of the lens body 1, so as to improve the radial separation of the lens body 1 and the uniformity of the refracted light.

[0068] Reference Figure 4 , in at least one embodiment, a method for preparing a microlens array composite metasurface contact lens, which is applied to prepare the microlens array composite metasurface contact lens as described above, and the preparation method includes the following steps:

[0069] Step S1, preparing lens material: preparing an unhydrated soft material with high oxygen permeability;

[0070] Step S2, rough machining of the outer shape: using a high-precision five-axis machining machine to perform preliminary rough machining of the customized microlens array and metasurface to the micron level to form a lens body 1;

[0071] Step S3, fine machining of the outer shape: using a single-crystal diamond machining of an ultra-precision lathe and combining a self-developed pendulum tool holder to machine the customized microlens array and metasurface to the nanometer level on a free-form surface to form a beam splitting structure 3 and a zoom structure 4;

[0072] Step S4, lens hydration: putting the processed lens into pure water for hydration to soften the lens and increase the water content.

[0073] Reference Figure 5 , in at least one embodiment, a method for preparing a microlens array composite metasurface contact lens, characterized in that it is applied to prepare the microlens array composite metasurface contact lens as described above, and the preparation method includes the following steps:

[0074] Step S1, preparing mold material: preparing high-quality phosphor bronze as a mold for single-crystal diamond machining of an ultra-precision lathe;

[0075] Step S2, preparing lens material: preparing an unhydrated soft material with high oxygen permeability;

[0076] Step S3, rough machining of the outer shape: using a high-precision five-axis machining machine to perform preliminary rough machining of the mold of the microlens array and metasurface to the micron level to meet the subsequent fine machining steps to form a lens body 1;

[0077] Step S4, fine machining of the outer shape: using an ultra-precision lathe combined with a pendulum tool holder to machine the microlens array and metasurface to the nanometer level on the mold surface to form a beam splitting structure 3 and a zoom structure 4;

[0078] Step S5, injection molding: injecting and molding the contact lens material by using the ultra-precision processed mold;

[0079] Step S6, lens hydration: putting the processed lens into pure water for hydration to soften the lens and increase the water content.

[0080] In step S1, high-purity phosphor bronze can be selected as the mold base material, which has good dimensional stability and thermal conductivity and is suitable for machining with nanometer-level precision. Through heat treatment and surface pre-polishing treatment, ensure that the material hardness, coaxiality, and surface roughness meet the requirements of subsequent ultra-precision machining. This mold will be used to carry a single-crystal diamond tool for micro-nano machining of free-form surfaces.

[0081] In step S2, select an unhydrated soft contact lens material, which should have a high oxygen permeability (Dk value > 100), good mechanical flexibility, and biocompatibility, such as silicone hydrogel. The material should be in a dry state or a partially hydrated state to maintain good dimensional controllability and surface transfer accuracy during subsequent injection molding.

[0082] In step S3, use a five-axis linkage micro-nano machining center with high-precision nanometer-level position feedback control to perform rough machining on the outer shape of the preliminarily designed free-form micro-lens array and meta-structure area, and control the morphology to micron-level precision. This step aims to quickly remove materials and form a preformed lens body 1 similar to the final morphology, leaving a margin for subsequent finish machining.

[0083] In step S4, use an ultra-precision machining lathe equipped with an air-bearing spindle and a high-stability bed, assemble a fast tool servo, use a single-crystal diamond tool with a radius less than 0.001 mm, and combine with a self-developed swing tool holder with the ability to machine high-curvature surfaces to complete the free-form surface nano-level machining of the micro-lens array and its meta-surface on the lens body 1. In step S3, precisely engrave the beam-splitting structure 3, such as sub-wavelength gratings, refractive index modulation structures, and zoom structures 4. The final surface roughness target is better than 10 nm Ra, and the morphology error is controlled within 400 nm PV.

[0084] In step S5, assemble the mold completed by precision machining into a high-resolution micro-injection molding machine, control the mold cavity temperature and pressure, and use a soft contact lens material for transfer molding of micro-nano structures. Control the time and temperature curve during the molding process to ensure the complete replication of the micro-lens array and meta-structure, and at the same time prevent the material from shrinking, deforming, or developing stress cracks.

[0085] In step S6, place the molded contact lens into a multi-stage purified water system for timed hydration treatment. In addition to softening the lens and improving hydrophilicity, this step can also remove injection molding residues and potential surface particle contamination. After completion, the lens will have a high water content (such as > 38%), while maintaining the functionality of its complex optical structure and wearing comfort.

[0086] In several embodiments provided by the present application, it should be understood that the disclosed systems, devices, and methods can be implemented in other ways. The device embodiments described above are merely illustrative. For example, the division of the units is only a logical function division, and there can be other division methods in actual implementation. For another example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Taking the above-described ideal embodiments of the present invention as an inspiration, through the above description, relevant staff can completely make various changes and modifications without departing from the technical idea of the disclosed embodiments of this item. The technical scope of the disclosed embodiments is not limited to the content in the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. A microlens array composite metasurface contact lens, characterized in that, Comprising: A lens body (1) having an out-of-focus surface (2) on its concave side; Wherein, the convex surface of the lens body (1) has a beam splitting structure (3) and a zoom structure (4), the zoom structure (4) is located at the edge of the lens body (1), and the beam splitting structure is located on one side of the zoom structure (4); And, the zoom structure (4) is adapted to adjust the refractive index of the edge of the lens body (1) so that the focal points at the edge of the lens body (1) and the focal point at the center of the lens body (1) both fall on the out-of-focus surface (2); The beam splitting structure (3) is adapted to separate the incident light into red light and blue light so that the red light is focused on the out-of-focus surface (2).

2. The microlens array composite metamaterial contact lens according to claim 1, wherein The zoom structure (4) includes a plurality of microlenses; The microlens array is arranged.

3. The microlens array composite metamaterial contact lens according to claim 1, wherein The beam splitting structure (3) includes a plurality of gratings; The gratings are arranged in sequence along the width direction.

4. A microlens array composite metasurface contact lens, characterized in that, Comprising: A lens body (1) having an out-of-focus surface (2) on its concave side; Wherein, the convex surface of the lens body (1) has a plurality of beam splitting structures (3) and a zoom structure (4), the zoom structure (4) is located at the edge of the lens body (1), and the beam splitting structure (3) is located on one side of the zoom structure (4); The beam splitting structure (3) and the zoom structure (4) are arranged alternately in sequence; And, the zoom structure (4) is adapted to adjust the refractive index of the edge of the lens body (1) so that the focal points at the edge of the lens body (1) and the focal point at the center of the lens body (1) both fall on the out-of-focus surface (2); The beam splitting structure (3) is adapted to separate the incident light into red light and blue light so that the red light is focused on the out-of-focus surface (2).

5. The microlens array composite metamaterial contact lens according to claim 4, wherein The beam splitting structure (3) and the zoom structure (4) are distributed along the circumferential direction and are connected end to end to form a ring.

6. A microlens array composite metasurface contact lens, characterized in that Comprising: A lens body (1) having an out-of-focus surface (2) on its concave side; Wherein, the convex surface of the lens body (1) has a plurality of correction rings (5), the correction rings (5) include a beam splitting structure (3) and a zoom structure (4), and the beam splitting structure (3) and the zoom structure (4) are arranged alternately in sequence; And, the zoom structure (4) is adapted to adjust the refractive index of the edge of the lens body (1) so that the focal points at the edge of the lens body (1) and the focal point at the center of the lens body (1) both fall on the out-of-focus surface (2); The beam splitting structure (3) is adapted to separate the incident light into red light and blue light so that the red light is focused on the out-of-focus surface (2).

7. The microlens array composite metamaterial contact lens according to claim 6, wherein The correction rings (5) are all coaxially arranged, and their axes all coincide with the axis of the lens body (1).

8. A preparation method of a microlens array composite metasurface contact lens, characterized in that, Applied to the preparation of the microlens array composite metamaterial contact lens according to any one of claims 1-7, the preparation method includes the following steps: Step S1, preparing lens material: preparing an unhydrated soft material with high oxygen permeability; Step S2, rough contour machining: Use a high-precision five-axis machining center to perform preliminary rough contour machining on the customized microlens array and metasurface to the micron level to form the lens body (1). Step S3, finish contour machining: Use a single-crystal diamond machining on an ultra-precision lathe and combine with a self-developed pendulum tool holder to machine the customized microlens array and metasurface on the free-form surface to the nanometer level to form the beam splitting structure (3) and the zoom structure (4). Step S4, lens hydration: Place the machined lens in pure water for hydration to soften the lens and increase the water content.

9. A preparation method of a microlens array composite metamaterial contact lens, characterized in that, Applied to the preparation of the microlens array composite metasurface contact lens as described in any one of claims 1-7, the preparation method comprises the following steps: Step S1, prepare mold material: Prepare high-quality phosphor bronze as the mold for single-crystal diamond machining on an ultra-precision lathe. Step S2, prepare lens material: Prepare an unhydrated soft material with high oxygen permeability. Step S3, rough contour machining: Use a high-precision five-axis machining center to perform preliminary rough contour machining on the customized microlens array and metasurface to the micron level to form the lens body (1). Step S4, finish contour machining: Use a single-crystal diamond machining on an ultra-precision lathe and combine with a self-developed pendulum tool holder to machine the customized microlens array and metasurface on the free-form surface to the nanometer level to form the beam splitting structure (3) and the zoom structure (4). Step S5, injection molding: Inject the contact lens material through the mold of ultra-precision machining for injection molding. Step S6, lens hydration: Place the machined lens in pure water for hydration to soften the lens and increase the water content.

Images