Optical composite film for preventing and controlling myopia and preparation method thereof

Abstract

The invention discloses an optical composite film for myopia prevention and control and a preparation method thereof, which are applied to the technical field of optical films, and the optical composite film is attached to a common myopic lens to keep the original refraction effect of the optical lens. Meanwhile, the space-time optical phase technology is adopted, asymmetric optical microstructure design of different phases or different spaces is replaced at different times, the obtained retina space and time changing optical signals can reduce retina stimulation signal adaptation, namely defocus shot, and then the defocus shot caused by static defocus of an existing myopia prevention and control technology is avoided; ocular axis growth is continuously delayed, and the dynamic space-time myopia prevention and control effect is achieved. And the diameter of the optical center of the optical film is about 10mm, the total area of the microstructure region is small, and the visual quality and the prevention and control effect are also considered.

Description

Technical Field

[0001] The present invention belongs to the technical field of optical films, and particularly relates to an optical composite film for myopia prevention and control and a preparation method thereof. Background Art

[0002] With the improvement of parents' awareness of myopia prevention and control, as well as factors such as the educational pressure and eye - using habits of teenagers, the demand for myopia prevention is increasing. Common myopia prevention and control products include defocus frame glasses, OK lenses, defocus soft lenses, etc.

[0003] Currently, a Chinese invention with the publication number: CN119291831B discloses an anti - blue - light optical protective film and a preparation method thereof. However, for existing defocus frame glasses and defocus soft lenses, the optical or scattering stimulation in the peripheral treatment area has a rotationally symmetric distribution, and the light signals at each position in the peripheral field of view are static and basically constant. Such static optical signals can cause the retina to produce neural adaptation, resulting in the discontinuation of myopia prevention and control that inhibits eye - axis growth after half a year to one year; at the same time, the visual quality is affected, and OK lenses have problems such as difficult fitting, low patient compliance, and high costs, so they cannot meet the usage requirements. Summary of the Invention

[0004] The purpose of the present invention is to provide an optical composite film for myopia prevention and control, which has the advantage that by using spatio - temporal optical phase technology, it can be attached to ordinary myopia lenses to achieve the prevention and control effects of continuously delaying eye - axis growth and dynamic spatio - temporal myopia.

[0005] The above - mentioned technical purpose of the present invention is achieved through the following technical solutions: An optical composite film for myopia prevention and control includes a protective film, a hardening structure layer containing optical elements, a substrate layer, an adhesive layer, a buffer layer, an adhesive layer, and a release layer. It is characterized in that: the protective layer and the hardening structure layer containing optical elements are sequentially arranged on the topmost layer and the sub - topmost layer of the substrate layer respectively, the buffer layer is arranged below the substrate layer, the release layer is arranged at the bottommost part of the buffer layer, and pressure - sensitive adhesive layers are arranged between the substrate layer and the buffer layer and between the buffer layer and the release layer.

[0006] By adopting the above - mentioned technical solutions, by attaching the optical film to an ordinary myopia lens, the original refractive effect of the optical lens can be retained. At the same time, by using spatio - temporal optical phase technology, different phases are changed at different times or an asymmetric optical microstructure design in different spaces is adopted. The obtained light signals with spatial and temporal changes on the retina will reduce the adaptation of retinal stimulation signals, that is, defocus saturation, and thus avoid defocus saturation caused by static defocus in existing myopia prevention and control technologies, continuously delay eye - axis growth, and achieve the prevention and control effect of dynamic spatio - temporal myopia. Moreover, the optical center diameter of the optical film is about 10 mm, and the total area of the microstructure area is small, which also takes into account visual quality and prevention and control effects.

[0007] The present invention is further configured such that: the base material layer is made of a biaxially oriented polycaprolactam (BOPA) film with a thickness between 50 and 150 μm, a calendered polycarbonate (PC) film, or a biaxially oriented polyethylene terephthalate (BOPET) film; the hardened structure layer containing optical elements is made of a UV optical adhesive that is UV-cured and has a thickness between 3 and 15 μm.

[0008] The present invention is further configured such that: the adhesive layer is a modified acrylic pressure-sensitive adhesive (PSA) formed by a coating process. The adhesive layer is mainly made of acrylate or methyl methacrylate-butadiene-styrene copolymer and additives such as a curing agent, and has a thickness between 10 and 40 μm.

[0009] The present invention is further configured such that: the buffer layer is made of a BOPET or BOPA or thermoplastic polyurethane (TPU) plastic film with a thickness between 10 and 50 μm; the release layer is a BOPET silicone-coated film with a thickness between 10 and 50 μm; the protective layer is a cast polyethylene (CPE) or cast polypropylene (CPP) protective film with a thickness between 30 and 50 μm.

[0010] A preparation method of an optical composite film for myopia prevention and control includes the following steps: Step 1: Material preparation. First, prepare a coiled material of PC or BOPET or BOPA with a thickness between 50 and 150 μm and a protective film on both sides, a coiled material of a BOPET or BOPA or TPU plastic film with a thickness between 10 and 50 μm, a coiled material of a cast polyethylene (CPE) or cast polypropylene (CPP) protective film with a thickness between 30 and 50 μm, and a coiled material of a BOPET silicone-coated film with a thickness between 10 and 50 μm, UV optical glue, a configured pressure-sensitive glue (PSA), and prepare a UV embossing machine with two unwind devices and two rewind devices; a pressure-sensitive adhesive coater with two unwind machines and one rewind machine; a laminating machine with two unwind devices and three rewind devices; Step 2: Preparation of a double-sided adhesive film. First, prepare an adhesive film with a structure of "PET release film / / PSA / / (BOPET or BOPA or TPU plastic film) / / PSA / / PET release film". Use the pressure-sensitive adhesive coater to coat a PSA adhesive layer on the selected BOPET or BOPA or TPU plastic film. After drying, attach the PET release film to the surface of the PSA adhesive layer through the second unwind reel and wind it up; then repeat the above process, coat the same formula and thickness of PSA on the back of the BOPET or BOPA or TPU plastic film, and attach the PET release film in the same way for standby; Step 3: Preparation of the substrate of the hardened structure layer with a protective film and containing optical elements. Using a UV embossing machine, install the PC or BOPET or BOPA coil with protective films on both sides on the first unwinding reel. First, peel off the CPE or CPP protective film on one side of the aforementioned substrate and wind it up. Subsequently, after coating the UV optical-grade glue on this side without the protective film, immediately enter the UV embossing device to emboss the designed optical element hardened structure, and then enter the second unwinding. Stick the prepared CPE or CPP protective film on the surface of the hardened structure layer containing optical elements; Step 4: Lamination. Install the composite films of Steps 2 and 3 on the first and second unwinding reels respectively. After peeling off the BOPET release film and the CPE or CPP protective film respectively, wind them up. Finally, laminate the PSA side and the substrate side of the hardened structure-free substrate containing optical elements, and finally wind it up to become the finished product - a composite optical film containing optical elements with myopia prevention and control functions; Step 5: Cutting of the composite optical film. Then, cut the prepared optical composite film according to the size of the round lens. The microstructure and the peripheral area of the optical film have no visible scratches or impurities to the naked eye, and the edge of the optical film is smooth and burr-free. Finally, stick the optical composite film on the lens.

[0011] The present invention is further configured as follows: In Step 1, the PC, BOPA, and BOPET plastic films, CPE, CPP cast films, TPU films, and PET release films are all formed into uniaxially stretched calendered PC, biaxially stretched BOPA, biaxially stretched BOPET, uniaxially stretched CPE, uniaxially stretched CPP films, and uniaxially stretched TPU film materials by extrusion and stretching. The thickness can be processed into films with different thicknesses by controlling the extrusion amount per unit time. The BOPET release film is processed by coating.

[0012] The present invention is further configured as follows: In Step 2, the BOPET or BOPA or TPU plastic film and the acrylic PSA adhesive layer are coated on the front and back sides in sequence by coating, and then protected by laminating with a release film to form a double-sided adhesive film. The force value of the PSA adhesive needs to meet the set requirements (adhesive force value range, 300~2000 (gf / 25mm).

[0013] The present invention is further configured as follows: In Step 3, during the UV embossing process, ensure that the major axis, minor axis, curved surface morphology, and sagittal height of each microstructure meet the set requirements.

[0014] The present invention is further configured as follows: In Step 4, during the lamination process, ensure that the appearance of the composite film has no defects visible to the naked eye such as bubbles.

[0015] The present invention is further configured such that: in step 5, the tools required for laminating the optical composite film include a lensometer, an oil-based marker pen, 75% alcohol, a balloon blower, an ultra-fine dust-free cloth, a rubber soft pad, and a film laminating tooling.

[0016] The present invention is further configured such that: in step 5, the specific film laminating process of the optical composite film is as follows: S1. Use a lensometer to check the spherical power, cylindrical power, and axis of the lens; press and mark on the front surface of the lens, and then use an oil-based marker pen to mark on the back surface of the lens according to the marked positions. S2. In a clean environment, use 75% alcohol to clean the front surface of the lens, and then use a balloon blower to blow it clean to ensure that there are no stains, dust, or foreign objects on the front surface of the lens. S3. Tear off the release layer of the optical film disc, and place the optical film on the white rubber soft pad with the adhesive layer facing up according to the phase requirements. S4. Place the front surface of the lens downward so that the optical center of the lens aligns with the cross center of the optical film, and slowly lower the lens until the lens touches the optical film. S5. Pick up the lens, place it face up on the base of the film laminating tooling and press it to make the optical film completely adhere to the front surface of the lens. S6. After laminating the film on the lens, defoam it with a defoaming machine for 5 minutes to 20 minutes. The defoaming conditions are: temperature 45°C, pressure 0.6 MPa, and keep for 4 minutes. S7. According to the information of the patient's pupil, pupillary distance, pupil height, etc., use an edging machine to grind the laminated lens into the required size and shape.

[0017] In summary, the present invention has the following beneficial effects: By attaching the optical composite film to a common myopia lens, the original refractive effect of the optical lens is retained. At the same time, the spatio-temporal optical phase technology is adopted, and by changing different phases at different times or the asymmetric optical microstructure design in different spaces, the light signals with spatial and temporal changes on the retina obtained will reduce the adaptation of the retinal stimulation signal, that is, defocus binocular summation, and thus avoid the defocus binocular summation caused by static defocus in the existing myopia prevention and control technology, continuously delay the growth of the eye axis, and achieve the prevention and control effect of dynamic spatio-temporal myopia. Moreover, the optical center diameter of the optical film is about 10 mm, and the total area of the microstructure region is small, which also takes into account the visual quality and the prevention and control effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic structural diagram of the optical composite film of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0019] The present invention will be further described in detail below with reference to the accompanying drawings.

[0020] Example 1: ReferenceFigure 1 An optical composite film for myopia prevention and control, comprising a protective film, a hardened structure layer containing optical elements, a substrate layer, an adhesive layer, a buffer layer, an adhesive layer, and a release layer. The protective film and the hardened structure layer containing optical elements are respectively disposed on the topmost layer and the sub-topmost layer of the substrate layer. The buffer layer is disposed at the lower part of the substrate layer, and the release layer is disposed at the lowermost part of the buffer layer. PSA adhesive layers are provided between the substrate layer and the buffer layer and between the buffer layer and the release layer.

[0021] Reference Figure 1 The protective film is made of a CPE film with a thickness of 30 - 50 μm, preferably 30 μm thick; the substrate layer is made of BOPET with a thickness between 50 - 150 μm, preferably 100 μm thick BOPET; the hardened structure layer containing optical elements is made of a UV optical adhesive cured by UV and with a thickness between 3 - 10 μm, preferably 5 μm thick.

[0022] Reference Figure 1 The PSA adhesive layer uses a polyurethane - modified acrylic adhesive system. The adhesive layer is mainly composed of polyurethane - modified acrylate, methyl methacrylate, and isocyanate curing agent and has a thickness between 10 - 40 μm, preferably 30 μm thick.

[0023] Reference Figure 1 The buffer layer is made of a BOPET film with a thickness between 10 - 50 μm, preferably 15 μm BOPET film; the release film is a low - release - force silicone - release BOPET film with a thickness of 10 - 50 μm, preferably 15 μm silicone - release BOPET film.

[0024] Working principle: By adopting the spatio - temporal optical phase technology, an optical film with an asymmetric optical microstructure design of different phases at different times or different spaces is used. Different microstructures are distributed on the optical film. The optical structure in the treatment area of the optical film is irregularly non - rotational in the meridian and azimuth directions, and the defocus amount changes with the change of the peripheral retinal spatial position, playing a role of dynamic space - time in space. The microstructures on the optical film are in the shape of water droplets, and the optical refractive powers of the microstructures at different positions show azimuthal changes, which are completely different from the spherical and aspherical surfaces of traditional defocus lenses. The light passes through the microstructures on the film and changes with the change of the peripheral retinal spatial position, showing dynamic changes at different azimuths and different relative retinal positions. Thus, it avoids the defocus saturation caused by static defocus in the existing myopia prevention and control technology, continuously delays the growth of the eye axis, and achieves the prevention and control effect of dynamic space - time myopia. At the same time, the optical center diameter of the optical film is about 10 mm, and the total area of the microstructure region is small, which also takes into account the visual quality and the prevention and control effect.

[0025] Example 2: An optical composite film for myopia prevention and control and its preparation method, comprising the following steps: ReferenceFigure 1 , an optical composite film for myopia prevention and control, comprising a protective film, a hardened structure layer containing optical elements, a substrate layer, an adhesive layer, a buffer layer, an adhesive layer, and a release layer. The protective film and the hardened structure layer containing optical elements are respectively arranged on the topmost layer and the sub-topmost layer of the substrate layer. The buffer layer is arranged at the lower part of the substrate layer, and the release layer is arranged at the lowermost part of the buffer layer. PSA adhesive layers are arranged between the substrate layer and the buffer layer and between the buffer layer and the release layer.

[0026] Reference Figure 1 , the protective film adopts a CPP film with a thickness of 30 - 50um, preferably 30um thick; the substrate layer is made of BOPA with a thickness between 50 - 150um, preferably 50um thick BOPA; the hardened structure layer containing optical elements adopts a UV optical adhesive cured by UV and with a thickness between 3 - 10um, preferably 3um thick.

[0027] Reference Figure 1 , the PSA adhesive layer adopts a polyurethane - modified acrylic adhesive system, and the adhesive layer is mainly composed of methyl methacrylate - based, methyl methacrylate - butadiene - styrene copolymer, and isocyanate - based curing agent and has a thickness between 10 - 40um, preferably 35um thick.

[0028] Reference Figure 1 , the buffer layer adopts a BOPET film with a thickness between 10 - 50um, preferably 12um BOPET film; the release film selects a low - release - force silicone - release BOPET film with a thickness of 10 - 50um, preferably 25um silicone - release PET film.

[0029] Optical film cutting: Then, the prepared optical film is cut according to the size of the round lens. The microstructure and the peripheral area of the optical film have no visible scratches and impurities to the naked eye, and the edge of the optical film is smooth without burrs. Finally, the optical film can be attached to the lens.

[0030] Example 3: Step 1: Material preparation. First, prepare coils of PC or BOPET or BOPA with a thickness between 50 - 150um and double - sided with protective films, coils of BOPET or BOPA or TPU plastic films with a thickness between 10 - 50um, coils of cast polyethylene (CPE) or cast polypropylene (CPP) protective films with a thickness between 30 - 50um, and coils of PET silicone films with a thickness between 10 - 50um, UV optical glue, prepared pressure - sensitive glue (PSA), and prepare a UV embossing machine with 2 unwinding devices and 2 rewinding devices; a pressure - sensitive adhesive coater with 2 unwinding machines and 1 rewinding machine; a laminating machine with 2 unwinding devices and 3 rewinding devices; Step 2: Preparation of the double-sided adhesive film. First, prepare an adhesive film with a structure of "10-50um PET release film / / 10-40um PSA / / 10-50um (BOPET or BOPA or TPU plastic film) / / 10-40um PSA / / 10-50um PET release film". Use a pressure-sensitive adhesive coater to coat a 20um thick PSA adhesive layer on a selected 50um thick TPU plastic film. After drying, attach a 35um thick PET release film to the surface of the PSA adhesive layer through the second unwind reel and wind it up. Subsequently, repeat the above process, coat PSA with the same formula and thickness on the back of the TPU plastic film, and attach a 15um thick BOPET release film in the same way for standby. Step 3: Preparation of the substrate with a protective film and a hardened structure layer containing optical elements. Use a UV embossing machine to install an 110um thick PC coil with protective films on both sides on the first unwind reel. First, peel off the CPE protective film on one side of the aforementioned substrate and wind it up. Subsequently, coat UV optical-grade glue on this side without the protective film, and then immediately enter the UV embossing device to emboss a designed 6um thick optical element hardened structure. Then enter the second unwind, and attach a prepared 30um CPE protective film to the surface of the hardened structure layer containing optical elements. During the UV embossing process, ensure that the major axis, minor axis, curved surface shape, and sag height of each microstructure meet the set requirements. Step 4: Lamination. Install the composite films from Steps 2 and 3 on the first and second unwind reels of the laminator respectively. After peeling off the 35um thick BOPET release film and the 30um thick CPE protective film respectively and winding them up, finally laminate the 20um thick PSA side with the substrate side without the hardened structure, and finally wind it up to become a finished product - a composite optical film with a myopia prevention and control function containing optical elements.

[0031] Step 5: Cutting of the composite optical film. Then cut the manufactured optical composite film according to the size of the round lens. There are no visible scratches or impurities in the microstructure and peripheral area of the optical film, and the edge of the optical film is smooth without burrs. Finally, attach the optical composite film to the lens.

[0032] When applying the optical film, the tools needed are a lensometer, an oil-based marker pen, 75% alcohol, a balloon blower, a superfine dust-free cloth, a rubber soft pad, and a film application tooling. The specific film application process for the optical film is as follows: S1. Use a lensometer to check the spherical power, cylindrical power, and axis of the lens; press and mark on the front surface of the lens, and then use an oil-based marker pen to mark on the back surface of the lens according to the marked positions; S2. In a clean environment, clean the front surface of the lens with 75% alcohol, and then use a balloon blower to blow it clean to ensure that there are no stains, dust, or foreign objects on the front surface of the lens; S3. Tear off the release layer of the optical film disc, and place the optical film with the adhesive layer facing up on the white rubber soft pad according to the phase requirements; S4. Place the front surface of the lens downward so that the optical center of the lens aligns with the cross center of the optical film, and slowly lower the lens until the lens touches the optical film; S5. Pick up the lens, place it face up on the base of the film application tooling and press it to make the optical film completely adhere to the front surface of the lens; S6. After applying the film on the lens, defoam it with a defoaming machine for 5 minutes to 20 minutes. The defoaming conditions are: temperature 45°C, pressure 0.6 MPa, and keep for 4 minutes; S7. According to the information such as the patient's pupil, pupillary distance, and pupil height, use a lens edging machine to grind the lens with the applied film into the required size and shape.

[0033] This specific embodiment is only an explanation of the present invention, and it is not a limitation of the present invention. After reading this specification, those skilled in the art can make modifications to this embodiment without creative contributions as needed, but as long as it is within the scope of the claims of the present invention, it is protected by the patent law.

Claims

1. An optical composite film for myopia prevention and control, comprising a protective film, a hardened structural layer containing optical elements, a substrate layer, a glue layer, a buffer layer, a glue layer, and a release layer, characterized in that: The protective layer and the hardened structural layer containing optical elements are respectively arranged on the top layer and the second top layer of the substrate layer in sequence, the buffer layer is arranged at the lower part of the substrate layer, the release layer is arranged at the bottom of the buffer layer, and a pressure-sensitive adhesive layer is arranged between the substrate layer and the buffer layer and between the buffer layer and the release layer.

2. The optical composite film for myopia prevention and control according to claim 1, characterized in that: The substrate layer is made of biaxially oriented polycaprolactam (BOPA), calendered polycarbonate (PC) or biaxially oriented polyethylene terephthalate (BOPET) film with a thickness of 50-150 um, and the hardened structural layer containing optical elements is made of UV optical glue that is UV-cured and has a thickness of 3-15 um.

3. The optical composite film for myopia prevention and control according to claim 1, characterized in that: The adhesive layer is made of modified acrylic pressure-sensitive adhesive (PSA) obtained through a coating process. The adhesive layer is mainly made of additives such as acrylates or methyl methacrylate-butadiene-styrene copolymers and curing agents, and has a thickness between 10-40 um.

4. The optical composite film for myopia prevention and control according to claim 1, characterized in that: The buffer layer is made of BOPET or BOPA or thermoplastic polyurethane (TPU) plastic film with a thickness of 10-50um, the release layer is made of BOPET silicon-coated film with a thickness of 10-50um, and the protective layer is made of cast polyethylene (CPE) or cast polypropylene (CPP) protective film with a thickness of 30-50um.

5. A method for preparing an optical composite film for myopia prevention and control, characterized in that: The following steps are involved: Step 1: Material preparation, first prepare PC or BOPET or BOPA coils with a thickness of 50-150um and double-sided protective films, BOPET or BOPA or TPU plastic film coils with a thickness of 10-50um, cast polyethylene (CPE) or cast polypropylene (CPP) protective film coils with a thickness of 30-50um, and BOPET silicon-coated film coils with a thickness of 10-50um, UV optical glue, configured pressure-sensitive adhesive (PSA), and prepare a UV embossing machine with 2 unwinding and 2 winding devices; a pressure-sensitive adhesive coating machine with 2 unwinding machines and 1 winding machine; a laminating machine with 2 unwinding devices and 3 winding devices; Step 2: Preparation of double-sided adhesive film: first make an adhesive film with the structure of "PET release film / / PSA / / (BOPET or BOPA or TPU plastic film) / / PSA / / PET release film", use a pressure-sensitive adhesive coating machine to coat the PSA adhesive layer on the selected BOPET or BOPA or TPU plastic film, and after drying, laminate the PET release film on the surface of the PSA adhesive layer through the second unwinding shaft, and reel it up; then repeat the above process, coat the PSA with the same formula and thickness on the back of the BOPET or BOPA or TPU plastic film, and laminate the PET release film for use; Step 3: Preparation of a substrate with a protective film and a hardened structure layer containing optical elements. Use a UV embossing machine to install a PC or BOPET or BOPA roll with protective films on both sides onto the first unwinding shaft. First, peel off the CPE or CPP protective film on one side of the aforementioned substrate and rewind it. Then, after coating the side without the protective film with UV optical grade glue, it instantly enters the UV embossing device to emboss the designed hardened structure of the optical element. Then, it enters the second unwinding machine and adheres the prepared CPE or CPP protective film to the surface of the hardened structure layer containing the optical element. Step 4: Lamination, the composite films of step 2 and 3 are respectively installed on the first and second unwinding shafts, and after the BOPET release film and CPE or CPP protective film are peeled off respectively, they are respectively rolled up, and finally the PSA side is laminated with the substrate side of the non-hardened structure containing optical elements, and finally rolled up into a finished product - a composite optical film containing optical elements with myopia prevention and control function; Step 5: Cutting of the composite optical film. The prepared optical composite film is then cut according to the size of the round lens. The microstructure and surrounding areas of the optical film have no scratches or impurities visible to the naked eye, and the edges of the optical film are smooth and free of burrs. Finally, the optical composite film is bonded to the lens.

6. The method for preparing an optical composite film for myopia prevention and control according to claim 5, characterized in that: In step 1, PC, BOPA and BOPET plastic films, CPE, CPP cast films, TPU films and PET release films are formed by extrusion and stretching to form uniaxially stretched calendered PC, biaxially stretched BOPA, biaxially stretched BOPET, uniaxially stretched CPE, uniaxially stretched CPP films, and uniaxially stretched TPU film materials. The thickness can be processed into films of different thicknesses by controlling the extrusion amount per unit time, and the BOPET release film is processed by coating.

7. The method for preparing an optical composite film for myopia prevention and control according to claim 5, characterized in that: In step 2, the BOPET or BOPA or TPU plastic film and the acrylic PSA adhesive layer are coated on the front and back sides in sequence, and then attached with a release film for protection to form a double-sided adhesive film. The strength value of the PSA adhesive must meet the set requirements (adhesion value range, 300~2000 (gf / 25mm).

8. The method for preparing an optical composite film for myopia prevention and control according to claim 5, characterized in that: In step 3, during the UV embossing process, it is ensured that the major axis, minor axis, curved surface morphology and sagittal height of each microstructure meet the set requirements.

9. The method for preparing an optical composite film for myopia prevention and control according to claim 5, characterized in that: In step 5, the tools that need to be prepared for the optical composite film lamination include a focal meter, an oil-based marker, 75% alcohol, a balloon, an ultra-fine dust-free cloth, a rubber cushion, and a film lamination tool.

10. The method for preparing an optical composite film for myopia prevention and control according to claim 5, characterized in that: In step 5, the specific film lamination process of the optical composite film is as follows: S1. Use a focal meter to check the spherical power, cylindrical power and axial power of the lens; press and mark the front surface of the lens, and then use an oil-based marker to draw points on the back surface of the lens according to the dot positions; S2. In a clean environment, use 75% alcohol to clean the front surface of the lens, and then use a balloon to blow it clean to ensure that there is no stain, dust or foreign matter on the front surface of the lens; S3. Tear off the release layer of the optical film disc, and place the optical film on the white rubber pad according to the phase requirements with the adhesive layer facing upward; S4. Turn the front surface of the lens downward, align the optical center of the lens with the cross center of the optical film, and slowly move the lens downward until the lens contacts the optical film; S5. Pick up the lens, with the front side facing up, and place it on the film laminating tooling base, pressing it so that the optical film is completely attached to the front surface of the lens; S6. Remove bubbles in a defoaming machine 5-20 minutes after applying the film on the lens. The defoaming conditions are: temperature 45°C, pressure 0.6MPa, and keep for 4 minutes; S7. According to the patient's pupil, pupil distance, pupil height and other information, use an edge grinder to grind the film-applied lens into the required size and shape.

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