Spectacle optical filter and preparation method thereof

Abstract

According to the glasses optical filter and the preparation method thereof, light in certain specific wave bands has high transmittance, light in certain wave bands has low light transmittance or even light cannot penetrate through the glasses optical filter, the utilization efficiency of natural light is improved, and the glasses optical filter is suitable for being used in glasses. The beneficial effect of preventing and controlling myopia caused by outdoor activities for 2 hours can be achieved in a shorter time, so that not only is safe myopia prevention and control equipment provided, but also the problem of harsh conditions for preventing and controlling myopia by using natural light is solved; meanwhile, the invention further provides a preparation method of the glasses optical filter, and the preparation method is used for optimizing the uniformity and firmness of the optical filter film. The invention relates to an optical filter for glasses, which can transmit light in a wave band with the wavelength of 650-660nm and attenuate light in other wave bands within the wavelength range of 380-800nm, and is used for outdoor wearing to prevent and control myopia.

Description

Technical Field

[0001] The invention relates to the technical field of ophthalmic optometry equipment, and in particular to a glasses filter for preventing and treating myopia. A preparation method of the glasses filter is also provided, so that the prepared filter can transmit light within a specific wavelength range. Background Art

[0002] As the eye-use environment changes, in terms of prevention of myopia in children, it is recommended that children spend at least 2 hours of outdoor activities every day to allow their eyes to be fully exposed to natural light; in addition, it is necessary to control the time of eye use, avoid long-term close-up use of the eyes, maintain correct reading and writing posture, ensure sufficient and soft light, and reduce the use of electronic products. In terms of treatment, for children who already have myopia, they should choose appropriate glasses or orthokeratology lenses for correction, and even need to take medication intervention; but the effect of myopia treatment is poor, mainly because of poor wearing comfort or poor compliance due to longer daily wear time, which makes it difficult to effectively prevent and control the development of myopia.

[0003] At present, researchers have studied the effects of light environment on myopia through a variety of animal models, thus providing a scientific basis for the optical control of myopia in children. For example, Ying-Yi Chen et al. found that in some animal experiments, such as tree shrews and rhesus monkeys, red light was observed to have an anti-myopia effect. For example, long-wavelength (red) light can cause hyperopia in young and adolescent tree shrews, and narrow-band long-wavelength lighting can promote hyperopia and delay the development of myopia in infant rhesus monkeys. At the same time, clinical studies have shown that repeated low-intensity red light (RLRL) therapy has shown a certain effect in slowing the progression of myopia in children, as shown by the reduction of refractive error and axial length change. Youssef MA et al. reviewed the effects of RLRL therapy on myopia in children, showing the effectiveness of 650nm RLRL red light in controlling myopia in short-term follow-ups of 3, 6, and 12 months, and showed positive effects in axial length AL, equivalent spherical diopter SER, and subfoveal choroidal thickness SFCT.

[0004] Based on the effect of red light on myopia prevention and control, there are light-feeding devices on the market. They stimulate the fundus through light irradiation of a specific wavelength, usually 650nm red light, and improve the microcirculation of the fundus, prompting the retina to release a large amount of dopamine, improving the axial length and refractive power of the eye, thereby achieving the purpose of preventing and controlling myopia. However, with the use of light-feeding devices, safety issues of the products have also been exposed, because they may cause retinal damage, so there is some controversy about their safety.

[0005] If we can utilize natural light sources and at the same time improve the efficiency of prevention and treatment, shortening the daily 2-hour outdoor activity time to half an hour or even shorter, then the prevention and control of myopia will be easier to achieve and safer. Summary of the invention

[0006] The present invention provides a glasses filter, which has high transmittance in certain specific bands of light, and has lower transmittance in certain bands or even no light can be transmitted. The glasses filter improves the utilization efficiency of natural light, so that the beneficial effect of myopia prevention and control brought about by 2 hours of outdoor activities can be achieved in a shorter time, thereby providing a safe myopia prevention and control equipment and solving the problem of harsh conditions for myopia prevention and control using natural light; at the same time, the present invention also provides a method for preparing the glasses filter, which is used to optimize the uniformity and firmness of the filter film.

[0007] In order to solve the above technical problems, the present invention adopts the following technical solutions: A glasses filter, which can transmit light in a wavelength band of 650-660nm and attenuate light in other wavelength bands within the wavelength range of 380-800nm. The glasses filter is used for outdoor wear to prevent and control myopia.

[0008] Furthermore, the transmittance of the eyeglass filter in the wavelength band of 650-660 nm is greater than 92%, and the transmittance of the remaining wavelength bands of light in the wavelength range of 380-800 nm is attenuated to 65-70%.

[0009] Furthermore, the eyeglass filter can transmit the following wavelengths of light: 380-400nm, 650-660nm, 430-600nm, 700-800nm, and the filter cuts off the remaining wavelengths of light within the wavelength range of 380-800nm.

[0010] Furthermore, the transmittance of the eyeglass filter in the wavelength bands of 380-400nm, 650-660nm, 430-600nm and 700-800nm ​​is respectively 65-70%, greater than 95%, 65-70%, 65-70%.

[0011] Furthermore, the eyeglass filter is composed of a substrate and a filter film fixed on the surface of the substrate, and the material of the substrate includes: optical glass, polycarbonate, polyallyl diglycol carbonate, polymethyl methacrylate.

[0012] Furthermore, the filter film is composed of a buffer layer fixed on the surface of a substrate, and an interference film system fixed on the buffer layer, and the interference film system is composed of L layers and H layers alternately stacked.

[0013] Furthermore, the preparation method of the buffer layer is as follows: ion-assisted bombardment deposition electron beam evaporation is performed on the pretreated substrate; wherein the electron beam power is 3-8kW, the evaporation rate is 0.1-0.5nm / s; the ion source voltage is set between 50-200V, the current is between 50-200mA, and the background vacuum of the vacuum chamber before deposition is 1×10 -4 -1×10 -3 Pa, maintained at 1×10 -3 - 1×10 -2 Pa range, the substrate temperature was set between 200-400°C and the deposition time was 220-370S.

[0014] Furthermore, the preparation method of the interference film system is as follows: evacuate the vacuum chamber to a vacuum degree of 5×10 -4 Pa, the substrate was heated to 185 ° C; deposition began from the L layer close to the buffer layer, the electron beam evaporation source was turned on, and the electron beam power was adjusted to control the SiO2 evaporation rate to 0.3nm / s. The film thickness was monitored in real time by a quartz crystal oscillator film thickness detector. When the film reached the corresponding thickness, the electron beam evaporation source was switched to TiO2, and the electron beam power was adjusted to make the evaporation rate 0.28nm / s, and a layer of TiO2 was deposited. This was repeated alternately until the deposition of 110 layers of film was completed. During the above process, the vacuum degree was maintained at 1×10 -3 -1×10 -2 Pa, and the vacuum degree is adjusted by introducing argon into the vacuum chamber. The voltage is 220V, and the currents of TiO2 and SiO2 are 10A and 12A respectively. After the coating is completed, the electron beam evaporation source and the substrate heating device are turned off, and the film is naturally cooled to 50°C to obtain the eyeglass filter.

[0015] Furthermore, the interference film system consists of a first film system and a second film system respectively located on the upper and lower surfaces of the substrate.

[0016] Furthermore, the preparation method of the first film system is: at a vacuum degree of 5×10 -4Pa, turn on the sputtering power of the silicon target to sputter silicon dioxide, the sputtering power is set to 120W, the argon flow rate is adjusted to 15-25sccm, the working gas pressure is maintained at 0.3-0.8Pa, and the sputtering rate is controlled at 0.1-0.2nm / s; the film thickness is monitored by a quartz crystal oscillation film thickness detector, and when the designed thickness is reached, the silicon dioxide sputtering is stopped; switch to the titanium pentoxide sputtering target source, and the DC sputtering power is set to 180W; the argon flow rate is adjusted to 18-25sccm, the working gas pressure is maintained at 0.4-0.9Pa, the sputtering rate is 0.1-0.18nm / s, and the film thickness meter is also used for monitoring. When the designed film thickness is reached, the titanium pentoxide sputtering is stopped; repeat the above process to form the first film system; after the coating is completed, naturally cool to room temperature in the vacuum chamber, slowly fill the vacuum chamber with high-purity nitrogen to balance the indoor air pressure with the outside, and take out the coated lens; The preparation method of the second film system is: at a vacuum degree of 5×10 -4 Pa, turn on the sputtering power supply connected to the silicon target, use the DC power supply to adjust the sputtering power to 80W, adjust the argon flow rate to 15sccm, stabilize the working gas pressure at 0.45Pa, and control the sputtering rate at 0.12nm / s. When the detector shows that the target thickness has been reached, stop the silicon dioxide sputtering; switch to the titanium pentoxide sputtering power supply, set the power to 120W, adjust the argon flow rate to 18sccm, stabilize the working gas pressure at 0.55Pa, and the sputtering rate is 0.1nm / s. When the detector shows that the target thickness has been reached, stop the titanium pentoxide sputtering; repeat the above process to form a second film system; after the coating is completed, naturally cool to room temperature in the vacuum chamber, slowly fill in high-purity nitrogen at a flow rate of 50sccm to balance the indoor air pressure with the outside world, take out the coated lens, and obtain the eyeglass filter.

[0017] Compared with the prior art, the present invention has the following beneficial technical effects: The present invention increases the light transmittance of a specific wavelength range by controlling the light transmittance of the eyeglass filter, thereby filtering the natural light by wavelength bands, activating the photoreceptor signals received by ipRGCs, affecting the changes in retinal neurotransmitters, and further inhibiting the excessive growth of the eye axis and delaying the development of myopia. Compared with light feeding instruments, the present invention is safer and has no obstacles in use, and can be worn during outdoor activities. The present invention increases the "efficiency" of light utilization through the eyeglass filter, and only needs to be worn for 20 to 30 minutes a day to achieve the prevention and control effect, which is easier to achieve than outdoor activities for more than 2 hours a day; The eyeglass filter of the present invention not only has a control effect on the development of myopia, but also has an effect on users with insufficient hyperopia reserve or nearly emmetropia, and can prevent the premature occurrence of myopia; The eyeglass filter of the present invention adds a transition layer when designing the film layer, and the adhesion and stability of the film layer are increased by the transition layer. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is a transmission spectrum diagram of a glasses filter according to embodiment 1 of the present invention; Figure 2 is a transmission spectrum diagram of a glasses filter according to embodiment 2 of the present invention; Figure 3 It is a schematic diagram of the design of an interference film layer in a glasses filter according to Embodiment 1 of the present invention; Figure 4 is a schematic diagram of the design of an interference film layer in an eye filter according to embodiment 2 of the present invention; Figure 5 is the test result of the eye axis length of user 1 before use in Experimental Example 1 of the present invention; Figure 6 is the test result of the eye axis length of user 1 after use in Experimental Example 1 of the present invention; Figure 7 is the test result of the axial length of the eye of user 2 before use in Experimental Example 1 of the present invention; Figure 8 This is the test result of the eye axis length after use by user 2 in Experimental Example 1 of the present invention; Fig. 9 The axial length test result of user 3 before use in Experimental Example 2 of the present invention; Fig.10 This is the test result of the eye axis length after use by user 3 in Experimental Example 2 of the present invention; Fig.11 is the test result of the axial length of the eye of user 4 before use in Experimental Example 3 of the present invention; Fig.12 is the test result of the eye axis length after use by user 4 in Experimental Example 3 of the present invention; Fig.13 is the test result of the axial length of the eye of user 5 before use in Experimental Example 4 of the present invention; Fig.14 This is the test result of the axial length of the eye after use by user 5 in Test Example 4 of the present invention.

[0019] in: 110, 210-substrate; 120, 220-buffer layer; 130, 230-interference film system; 131, 231-L layers; 132, 232-H floors. DETAILED DESCRIPTION

[0020] The technical solution of the present invention will be described in detail below with reference to the accompanying drawings.

[0021] For children, myopia requires attention not only to the control of myopia, but also to the prevention of myopia. During the period of childhood and adolescence, the eyeball and vision are in a stage of gradual development and maturation. As they grow and develop, the eyeball gradually grows larger, the eye axis becomes longer, and the physiological hyperopia gradually decreases, thus tending to emmetropia. After emmetropia, if the eyeball continues to grow and becomes too long, it will develop into myopia. In addition to affecting daily life and study, premature myopia can easily develop into high myopia if it is not controlled. High myopia is irreversible. As the eye axis continues to lengthen, the retina will slowly become thinner or even torn, leading to ischemia of the fundus, which can cause a variety of serious eye problems such as retinopathy and macular degeneration.

[0022] Repeated low-intensity red light RLRL therapy can effectively inhibit the growth of the eye axis, thereby achieving the purpose of treating and preventing myopia. The possible reason is based on the regulation of ipRGCs-related neurotransmitters. Ai-Lin Liu et al. studied the mechanism of action of ipRGCs in eye growth and myopia development. The results showed that it regulates the axial length (AL) of the eye and the radius of corneal curvature (CRC) through melanopsin signals and rod / cone drive signals, respectively, to achieve the effect of myopia prevention and control.

[0023] Based on single-vision glasses, the present invention selects the wavelength of light by coating the glasses lenses. When worn during outdoor activities, light of a specific wavelength band in natural light enters the eye through the glasses lenses, thereby improving the efficiency of myopia prevention and treatment, so that the effect of the original 2-hour outdoor activity can be achieved in a shorter time (such as half an hour). To achieve the above effect, it is necessary to determine the appropriate wavelength band. Although existing studies have shown that light with a wavelength of 650nm has a good effect, when it is applied to glasses lenses, only this wavelength cannot be retained. Usually, a certain wavelength with high transmittance is retained; but wavelengths of other bands cannot be completely cut off. Completely cutting off will affect vision and thus affect the development of normal outdoor activities.

[0024] In the selection of eyeglass lens materials, the commonly used materials are optical glass, polycarbonate, polyallyl diglycol carbonate, and polymethyl methacrylate.

[0025] Optical glass has a high refractive index and high stability and is a commonly used material for eyeglass lenses. Polycarbonate is a thermoplastic that is widely used in eyeglass lenses. It has extremely high impact resistance and is lightweight, which can improve wearing comfort. It is a commonly used material for children's glasses. Polyallyl diglycol carbonate CR-39 has unique optical performance advantages. It has good optical transparency and a relatively low dispersion coefficient, which can effectively reduce dispersion and avoid chromatic aberration in imaging. Currently, the application of CR-39 in eyeglass lenses is gradually gaining favor and is often used to manufacture high-quality aspheric lenses. Polymethyl methacrylate has the characteristics of easy processing and good optical uniformity, and is widely used in the primary processing of eyeglass lenses.

[0026] In the selection of filter film materials, metal oxides such as titanium dioxide TiO 2 、ZrO 2 、Silicon dioxide SiO 2 are commonly used materials. Titanium dioxide has a moderate refractive index in the visible light band. Its crystal structure makes the film dense and can increase the mechanical strength and chemical stability of the film. Zirconium dioxide has the characteristics of high refractive index. In the design of multi-layer film systems, it can accurately adjust the interference effect of light in different bands, which helps to achieve complex transmittance control goals. In addition, magnesium fluoride MgF 2 It is also an important choice. It absorbs less light in a specific band and has low scattering. When constructing an anti-reflection film structure, its low refractive index is combined with a high refractive index material to effectively reduce cross-sectional reflection and improve the transmittance of light in a specific band.

[0027] The laws of interference, refraction and reflection of light are the cornerstones of optical coating design. During the coating process, by precisely controlling the thickness of the film layer, optical fibers of a specific wavelength are made to interfere with each other after being reflected at the upper and lower interfaces of the film layer, thereby achieving the effect of enhancing or weakening the intensity of the transmitted light. In addition, it is necessary to consider the change in the propagation path caused by the refraction of light between the film layers to accurately calculate the optical path difference and ensure constructive interference in the target band. By making the phase difference of the reflected light at the upper and lower interfaces of the film layer meet specific conditions, the reflected light is caused to cancel each other out, thereby reducing the reflectivity of the lens surface and improving the light transmission performance. In summary, multilayer film systems are usually constructed by alternately coating high and low refractive index film layers, and using multiple reflections and interferences of light between different film layers to construct a film system structure with specific spectral response characteristics. For periodic multilayer film systems, their reflectivity (R) and transmittance (T) can be accurately calculated by the characteristic matrix method. This method can accurately predict the optical performance of the film system at different wavelengths by constructing the characteristic matrix of each film layer and recursively solving it according to the boundary conditions, providing theoretical support for film layer design. Example 1

[0028] This embodiment uses Corning glass (CORNING 0211) as the substrate, and a filter film is plated on the optical glass to obtain a glasses filter. The glasses filter has high transmittance in the 650-660nm band. At the same time, the transmittance in the 380-800nm ​​range except the 650-660nm range is attenuated. Among them, high transmittance refers to a transmittance greater than or equal to 92%; the degree of attenuation is preferably a transmittance of 65-70% in the attenuated band. The glasses filter is tested using a spectrophotometer, and the spectral results are as follows: Figure 1 shown. Example 2

[0029] This embodiment uses Corning glass (CORNING 0211) as a substrate, and a filter film is plated on the optical glass to obtain a glasses filter. The glasses filter of this embodiment has an ultra-high transmittance in the band range of 650 (inclusive)-660 (exclusive) nm. At the same time, the glasses filter has a light transmittance of 65-70% in the bands of 380 (inclusive)-400 (exclusive) nm, 430 (inclusive)-600 (exclusive) nm, and 700 (inclusive)-800 (exclusive) nm. In addition, the light in the remaining bands other than the above-mentioned bands within 380 (inclusive)-800 (inclusive) nm is cut off. Different from Example 1, this embodiment has an ultra-high transmittance in the band of 650-660nm, and the ultra-high transmittance refers to a transmittance greater than 95. The glasses filter was tested using a spectrophotometer, and the spectral results are as follows: Figure 2 shown.

[0030] Among them, in all the wavebands in the embodiments, except for the total waveband 380-800m, both end values ​​are included, and the remaining waveband ranges all include the smaller end value but exclude the larger end value. In a more preferred solution, in order to protect the filter film, a PE protective film is coated on the outside of the filter film. Example 3

[0031] This embodiment is a method for preparing the eyeglass filter in embodiment 1. It includes the processes of substrate pretreatment and coating.

[0032] Substrate pretreatment: Place the optical glass in acetone and anhydrous ethanol in turn, set the ultrasonic frequency to 30-40kHz, and clean for 10-15 minutes to remove dirt on the lens surface; then rinse with deionized water for multiple times to remove residual cleaning agent; blow dry with nitrogen, and store in a vacuum chamber for later use.

[0033] Coating: The film structure of the filter film is as follows Figure 3As shown: a buffer layer 120 is plated on the substrate 110, the thickness of the buffer layer 120 is 65-110nm, and the film material of the buffer layer 120 is ZrO 2 The buffer layer 120 is used to buffer the stress generated during the subsequent film growth process to prevent the film from falling off or cracking, and to ensure the formation of a uniform and stable film (which is mainly based on ZrO 2 and CORNING0211 have good lattice matching); in addition, ZrO 2 It also has a higher refractive index, which helps to preliminarily adjust the light propagation path and lay the foundation for subsequent multi-layer interference structures.

[0034] The buffer layer 120 is prepared by ion-assisted bombardment deposition electron beam evaporation technology on the pretreated substrate. The electron beam power is 3-8kW, the evaporation rate is 0.1-0.5nm / s; the ion source voltage is set between 50-200V, and the current is between 50-200mA; the background vacuum of the vacuum chamber before deposition is 1×10 -4 - 1×10 -3 Pa, maintained at 1×10 -3 - 1×10 -2 Pa range; substrate temperature is set between 200-400℃; deposition is 220-370S.

[0035] In the buffer layer ZrO 2 The layers are alternately deposited with SiO 2 and TiO 2 The interferometric film system 130 composed of alternating components is designed and optimized by software. The film system is designed as a base material {[LH]^S} vacuum, wherein the L layer 131 represents the film material as SiO 2 , H layer 132 indicates that the film material is TiO 2 The total thickness of the film layer is designed to be in the range of 10-20 μm, and the number of designed film layers is 110. The thickness distribution of each layer is shown in Table 1.

[0036] Table 1

[0037] The preparation method of the interference film system 130 is as follows: evacuate the vacuum chamber to a vacuum degree of 5×10 -4 Pa, heat the substrate to 185 ° C; start deposition from the L layer close to the buffer layer, turn on the electron beam evaporation source, and adjust the electron beam power to make SiO 2 The evaporation rate is controlled at 0.3 nm / s, and the film thickness is monitored in real time by a quartz crystal oscillator film thickness detector. When the film reaches the corresponding thickness in the above table, the electron beam evaporation source is switched to TiO 2, adjust the electron beam power to make the evaporation rate 0.28nm / s, and deposit a layer of TiO 2 , and so on, until the deposition of 110 layers of film is completed. During the above process, the vacuum degree is maintained at 1×10 -3 -1×10 -2 Pa, the vacuum degree was adjusted by introducing argon into the vacuum chamber, the voltage was 220V, and the TiO 2 and SiO 2 The currents are 10 A and 12 A respectively. After the coating is completed, the electron beam evaporation source and the substrate heating device are turned off, and the substrate is naturally cooled to 50° C. to obtain the eyeglass filter 10 . Example 4

[0038] This embodiment is a method for preparing the eyeglass filter in embodiment 2. It mainly includes the process of substrate pretreatment and coating. Because the substrates are the same, the steps of substrate pretreatment in this embodiment are the same as those in embodiment 3. The difference is that in order to improve the transmittance in the range of 650-660nm and make it have ultra-high transmittance, this embodiment further optimizes the film system structure, adopts a double-layer film system design structure, and adopts a sputtering process to prepare the film layer. The film layer structure is as follows Figure 4 shown.

[0039] The specific preparation method of the film layer is as follows: a buffer layer 220 is plated on the upper surface and the lower surface of the substrate 210 . The thickness and preparation method of the buffer layer 220 are the same as those in Example 3 and will not be described again.

[0040] In the buffer layer ZrO 2 The layers are alternately deposited with SiO 2 and Ti 3 O 5 The interference film system 230 is composed of alternating layers, wherein the film system located on the upper surface of the substrate 210 is the first film system, and the film system on the lower surface of the substrate 210 is the second film system. The film system is designed and optimized by software. The first film system and the second film system are both designed as a substrate {[LH]^S} vacuum, and the L layer 231 represents the film material as SiO 2 , H layer 232 indicates that the film material is Ti 3 O 5 The total thickness design range of the first film system is 3-6μm, the total thickness design range of the second film system is 2-4μm, the design film layer of the first film system is 46 layers, and the design film layer of the second film system is 34 layers. The thickness of each film layer is shown in Table 2.

[0041] Table 2

[0042] The preparation method of the first film system is : At vacuum degree 5×10 -4Pa, turn on the sputtering power of the silicon target to retain the sputtering of silicon dioxide, the sputtering power is set to 120W, the argon flow rate is adjusted to 15-25sccm, the working pressure is maintained at 0.3-0.8Pa, and the sputtering rate is controlled at 0.1-0.2nm / s; the film thickness is detected by a quartz crystal oscillator film thickness detector, and when the designed thickness is reached, the silicon dioxide sputtering is stopped. Switch to the titanium pentoxide sputtering target source, and the DC sputtering power is set to 180W. The argon flow rate is adjusted to 18-25sccm, the working pressure is maintained at 0.4-0.9Pa, the sputtering rate is 0.1-0.18nm / s, and the film thickness meter is also used for detection. When the designed film thickness is reached, the titanium pentoxide sputtering is stopped; repeat the above process to form the first film system. After the coating is completed, it is naturally cooled to room temperature in the vacuum chamber, and high-purity nitrogen is slowly filled into the vacuum chamber to balance the indoor air pressure with the outside world, and the coated lens is taken out.

[0043] The preparation method of the second film system is : At vacuum degree 5×10 -4 Pa, turn on the sputtering power supply connected to the silicon target, adjust the sputtering power to 80W with the DC power supply, adjust the argon flow rate to 15sccm, stabilize the working pressure at 0.45Pa, and control the sputtering rate at 0.12nm / s. When the detector shows that the target thickness has been reached, stop the silicon dioxide sputtering; switch to the titanium pentoxide sputtering power supply, set the power to 120W, adjust the argon flow rate to 18sccm, stabilize the working pressure at 0.55Pa, and the sputtering rate is 0.1nm / s. When the detector shows that the target thickness has been reached, stop the titanium pentoxide sputtering; repeat the above process to form the second film system. After the coating is completed, naturally cool to room temperature in the vacuum chamber, slowly fill in high-purity nitrogen at a flow rate of 50sccm to balance the indoor air pressure with the outside, take out the coated lens, and obtain the eyeglass filter.

[0044] For those skilled in the art, in addition to optical glass, the material of the substrate can also be selected from common lens materials such as polycarbonate, polyallyl diglycol carbonate, polymethyl methacrylate, etc.

[0045] The test example uses the eyeglass filters of Example 1 and Example 2. After CNC cutting, breaking, rounding, chamfering, cleaning and inspection, the eyeglass filters are placed in a frame for monocles for use. They can also be made into lens clips and clamped on monocles for use. For those skilled in the art, the structure of the lens clip and the fixation of the lens in the frame are common knowledge. Users wear glasses with eyeglass filters fixed on them or clamp the eyeglass clip on monocles for use. The usage scenario is outdoor activities and the usage time is 30 minutes per day. By filtering natural light, relatively more light in the 650-660nm band is transmitted, thereby controlling the activity of ipRGCs cells, thereby achieving the purpose of controlling the growth of the eye axis.

[0046] Test Example 1: This test example uses the eyeglass filter of Example 1, and selects children who already have myopia. Eye examinations are performed before and after a period of time. By comparing data, the changing trends of myopia-related parameters are observed, thereby judging the control effect of the eyeglass filter of Example 1 on children's myopia.

[0047] User 1: 9 years old, started wearing the device on July 21, 2024, and was tested on December 13 of the same year, with a usage time of 145 days. The comparison of the test results is shown in Table 3.

[0048] Table 3

[0049] The results of the axial length test before and after are as follows Figure 5 and Figure 6 As shown in the figure, from the data analysis, after 145 days of use, the axial length of the right eye increased by 0.15mm, and the axial length of the left eye increased by 0.1mm; the DS value did not change, and the DC value of the left eye decreased. It is normal for the axial length to increase with the age of children. Although the axial length has increased, the refractive power has a trend of improvement, and the degree of myopia has been controlled to a certain extent. This user has used it for a short time, and can obtain better control effects by continuing to use it.

[0050] User 2: 10 years old, started wearing the device on June 17, 2023, tested on December 1, 2024, and used it for a total of 534 days. The comparison of the test results is shown in Table 4.

[0051] Table 4

[0052] The results of the axial length test before and after are as follows Figure 7 and Figure 8 As shown, from the data analysis, it can be seen that after 534 days of use, the axial length of the right eye increased by 0.11mm, and the axial length of the left eye increased by 0.06mm; the DS value of the left eye increased by 0.25, and the DC value decreased by 0.25, indicating that the refractive power has improved significantly and the axial length has increased slowly. It can be seen that it has a certain control effect on myopia.

[0053] Test Example 2: This test example uses the eyeglass filter of Example 1, and selects children with near emmetropia. Eye examinations are performed before and after a period of time. The changing trends of myopia-related parameters are observed through data comparison (because children are in the growth and development period, the eyeball and eye axis will grow with age, and if the growth exceeds the limit, myopia will occur), so as to determine the preventive effect of the eyeglass filter of Example 1 on myopia in children.

[0054] User 3: 10 years old, started wearing the lenses on March 15, 2024, and was retested on December 22, 2024, with a wearing time of 282 days. The comparison of the test results is shown in Table 5.

[0055] Table 5

[0056] The results of the axial length test before and after are as follows Fig. 9 and Fig.10 As shown in the figure, from the data analysis, we can see that the axial length of the right eye increased by 0.05mm, and the axial length of the left eye increased by 0.09mm; the refractive power of the right eye and the left eye is close to the emmetropia state; after wearing, the DS of the right eye increased from -0.50 to -0.25, and the left eye returned to emmetropia; the DC of the right eye returned to emmetropia, and the left eye remained emmetropia. It can be seen that the axial length increases slowly, and the refractive power gradually adjusts to the emmetropia state, indicating that the lens has a certain preventive effect on myopia.

[0057] Test Example 3: This test example uses the eyeglass filter of Example 2, and selects children who already have myopia. Eye examinations are performed before and after a period of time. By comparing data, the changing trends of myopia-related parameters are observed, thereby judging the control effect of the eyeglass filter of Example 2 on children's myopia.

[0058] User 4: 13 years old, started wearing the device on May 18, 2024, and was retested on December 7, 2024, with a wearing time of 203 days. The comparison of the test results is shown in Table 6.

[0059] Table 6

[0060] The results of the axial length test before and after are as follows Fig.11 and Fig.12 As shown, from the above data, we can see that the axial length of the right eye decreased by 0.09mm, and the axial length of the left eye decreased by 0.1mm; the DS value of the left eye increased by 0.25; the axial length decreased significantly, and the refractive power of the left eye improved, indicating that the myopia is improving.

[0061] Test example 4: This test example uses the eyeglass filter of Example 1, and selects children with near emmetropia. Eye examinations are performed before and after a period of time. The changing trends of myopia-related parameters are observed through data comparison (because children are in the growth and development period, the eyeball and eye axis will grow with age, and if the growth exceeds the limit, myopia will occur), so as to determine the preventive effect of the eyeglass filter of Example 1 on myopia in children.

[0062] User 5: 7 years old, started wearing the device on June 17, 2023, and was retested on December 13, 2024, with a wearing time of 577 days. The comparison of the test results is shown in Table 7.

[0063] Table 7

[0064] The results of the axial length test before and after are as follows Fig.13 and Fig.14 As shown in the figure, from the data analysis, we can see that the axial length of the right eye increased by 0.15mm, and the axial length of the left eye increased by 0.18mm; the DS values ​​of the right and left eyes decreased, among which the right eye reached emmetropia, the DC value of the right eye decreased to emmetropia, and the left eye maintained refractive emmetropia. It can be seen that over a long period of time, the axial length growth and refractive power change are relatively slow, which has a certain preventive effect.

[0065] Although the inventive concept of the present invention has been explained in detail in conjunction with specific embodiments, for those skilled in the art, as long as the replacement of materials such as substrates and film materials does not deviate from the inventive concept of the present invention, and the replacement of coating methods such as evaporation and sputtering, they should be considered to be within the scope of protection of the present invention.

Claims

1. A filter for glasses, characterized in that: The eyeglass filter can transmit light in a wavelength band of 650-660nm and attenuate light in other wavelength bands within the wavelength range of 380-800nm. The eyeglass filter is used for outdoor wear to prevent and control myopia.

2. The eyeglass filter according to claim 1, characterized in that: The transmittance of the eyeglass filter in the wavelength band of 650-660nm is greater than 92%, and the transmittance of the remaining wavelength bands of light in the wavelength range of 380-800nm ​​is attenuated to 65-70%.

3. The eyeglass filter according to claim 1, characterized in that: The eyeglass filter can transmit the following wavelengths of light: 380-400nm, 650-660nm, 430-600nm, 700-800nm, and the filter cuts off the remaining wavelengths of light within the wavelength range of 380-800nm.

4. The eyeglass filter according to claim 3, characterized in that: The transmittance of the eyeglass filter in the wavelength bands of 380-400nm, 650-660nm, 430-600nm and 700-800nm ​​is respectively 65-70%, greater than 95%, 65-70% and 65-70%.

5. The eyeglass filter according to claim 1, characterized in that: The eyeglass filter is composed of a substrate and a filter film fixed on the surface of the substrate. The materials of the substrate include: optical glass, polycarbonate, polyallyl diglycol carbonate, and polymethyl methacrylate.

6. The eyeglass filter according to claim 5, characterized in that: The filter film is composed of a buffer layer fixed on the surface of a substrate and an interference film system fixed on the buffer layer. The interference film system is composed of L layers and H layers alternately stacked.

7. A method for preparing the eyeglass filter according to claim 6, characterized in that: The preparation method of the buffer layer is as follows: ion-assisted bombardment deposition electron beam evaporation is performed on the pretreated substrate; wherein the electron beam power is 3-8kW, the evaporation rate is 0.1-0.5nm / s; the ion source voltage is set between 50-200V, the current is between 50-200mA, and the background vacuum of the vacuum chamber before deposition is 1×10 -4 -1×10 -3 Pa, maintained at 1×10 -3 - 1×10 -2 Pa range, the substrate temperature was set between 200-400°C and the deposition time was 220-370S.

8. The method for preparing a spectacles filter according to claim 7, characterized in that: The preparation method of the interference film system is as follows: evacuate the vacuum chamber to a vacuum degree of 5×10 -4 Pa, the substrate was heated to 185 ° C; deposition began from the L layer close to the buffer layer, the electron beam evaporation source was turned on, and the electron beam power was adjusted to control the SiO2 evaporation rate to 0.3nm / s. The film thickness was monitored in real time by a quartz crystal oscillator film thickness detector. When the film reached the corresponding thickness, the electron beam evaporation source was switched to TiO2, and the electron beam power was adjusted to make the evaporation rate 0.28nm / s, and a layer of TiO2 was deposited. This was repeated alternately until the deposition of 110 layers of film was completed. During the above process, the vacuum degree was maintained at 1×10 -3 -1×10 -2 Pa, and the vacuum degree is adjusted by introducing argon into the vacuum chamber. The voltage is 220V, and the currents of TiO2 and SiO2 are 10A and 12A respectively. After the coating is completed, the electron beam evaporation source and the substrate heating device are turned off, and the film is naturally cooled to 50°C to obtain the eyeglass filter.

9. The method for preparing a spectacles filter according to claim 7, characterized in that: The interference film system consists of a first film system and a second film system respectively located on the upper and lower surfaces of the substrate.

10. The method for preparing a spectacles filter according to claim 9, characterized in that: The preparation method of the first film system is: at a vacuum degree of 5×10 -4 Pa, turn on the sputtering power of the silicon target to sputter silicon dioxide, the sputtering power is set to 120W, the argon flow rate is adjusted to 15-25sccm, the working gas pressure is maintained at 0.3-0.8Pa, and the sputtering rate is controlled at 0.1-0.2nm / s; the film thickness is monitored by a quartz crystal oscillation film thickness detector, and when the designed thickness is reached, the silicon dioxide sputtering is stopped; switch to the titanium pentoxide sputtering target source, and the DC sputtering power is set to 180W; the argon flow rate is adjusted to 18-25sccm, the working gas pressure is maintained at 0.4-0.9Pa, the sputtering rate is 0.1-0.18nm / s, and the film thickness meter is also used for monitoring. When the designed film thickness is reached, the titanium pentoxide sputtering is stopped; repeat the above process to form the first film system; after the coating is completed, naturally cool to room temperature in the vacuum chamber, slowly fill the vacuum chamber with high-purity nitrogen to balance the indoor air pressure with the outside, and take out the coated lens; The preparation method of the second film system is: at a vacuum degree of 5×10 -4 Pa, turn on the sputtering power supply connected to the silicon target, use the DC power supply to adjust the sputtering power to 80W, adjust the argon flow rate to 15sccm, stabilize the working gas pressure at 0.45Pa, and control the sputtering rate at 0.12nm / s. When the detector shows that the target thickness has been reached, stop the silicon dioxide sputtering; switch to the titanium pentoxide sputtering power supply, set the power to 120W, adjust the argon flow rate to 18sccm, stabilize the working gas pressure at 0.55Pa, and the sputtering rate is 0.1nm / s. When the detector shows that the target thickness has been reached, stop the titanium pentoxide sputtering; repeat the above process to form a second film system; after the coating is completed, naturally cool to room temperature in the vacuum chamber, slowly fill in high-purity nitrogen at a flow rate of 50sccm to balance the indoor air pressure with the outside world, take out the coated lens, and obtain the eyeglass filter.

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