A vision correction lens capable of absorbing harmful light and enhancing beneficial red light and its production process

Abstract

The present invention discloses a vision correction lens that absorbs harmful light and enhances beneficial red light, which is composed of the following raw materials in percentage by weight: 0.5‰-3‰ blue light absorber; 0.5%-1.5% ultraviolet absorber; 0.1%-1% rare earth europium compound; 1%-3% epoxy resin; and the remainder of resin material for lenses. The production process includes: (1) weighing each raw material according to weight percentage, mixing each raw material and stirring for 1.5 hours to obtain a mixture for standby use; (2) after the mixture is left to stand for 1.5 hours, vacuumizing for 0.5 hours; (3) heating the mixture for a primary curing treatment; (4) opening a mold, trimming, and cleaning; (5) continuing to heat for a secondary curing treatment; (6) clamping, hardening, and inspection; (7) hardening and curing treatment; (8) coating treatment. The present invention effectively utilizes natural sunlight, and through the rational use of beneficial red light, harmful light is converted into beneficial red light, thereby supplementing insufficient eye light and relieving visual fatigue.

Description

Technical Field

[0001] The invention belongs to the technical field of optical lenses, and in particular relates to a lens for vision correction capable of absorbing harmful light and enhancing beneficial red light, and a production process thereof. Background Art

[0002] Nowadays, myopia has become a common problem worldwide, especially among young people, and has become one of the three major public health problems in schools in my country. With the development of science and technology and changes in people's lifestyles, the incidence of myopia has increased year by year due to factors such as long-term use of electronic devices and incorrect eye habits. Myopia has become a common problem among young people in my country. According to the latest data, the overall myopia rate of children and adolescents in China in 2023 was 52.7%, including 35.6% for primary school students, 71.1% for junior high school students, and 80.5% for high school students23. In addition, the problem of myopia at a younger age is also very serious. Some children have myopia before they go to primary school. The incidence rate is increasing year by year and is showing a trend of younger age. High myopia can cause macular degeneration, cataracts, retinal detachment, choroidal neovascularization and other related complications. These complications have become the main causes of visual impairment and blindness, seriously affecting the quality of life of individuals. Therefore, myopia has become a social health issue of common concern to families, education and health departments, and the prevention and control of myopia is particularly important.

[0003] So far, the world has not found a way to completely cure myopia. The only way is to slow down the progression of myopia. The current means of myopia prevention and control include: developing good eye habits, ensuring adequate sleep, a balanced diet, outdoor activities, regular checkups, and scientifically wearing glasses. For patients who have been diagnosed with myopia, wearing glasses to control the degree of the eyes is currently the most widely used and economical means to address the problem of decreased vision. Wearing myopia glasses can correct vision, slow down the growth of myopia, prevent eye diseases, and protect the eyes. For patients who have been diagnosed with myopia, scientifically wearing glasses and regular checkups can avoid worsening of the degree, which can effectively control the problem of increased myopia in patients to a certain extent.

[0004] The main cause of eye fatigue is excessive use of the eyes. That is to say, although wearing myopia glasses can achieve the purpose of vision correction, long-term use of the eyes will still cause eye fatigue. Therefore, for patients with myopia problems, eye fatigue will aggravate the increase in myopia, resulting in the inability to achieve satisfactory myopia prevention and control effects even if wearing vision correction myopia glasses. This is also an important reason why the increase in myopia cannot be completely controlled by wearing myopia correction glasses. At present, there are light feeding devices or red light therapy devices on the market to treat eye fatigue problems. It is an instrument that treats the eyes through weak lasers. It irradiates the eyes with low-intensity red light to cause optical reactions in the retina, and then increases retinal circulation and metabolic processes. The principle is to use a safe semiconductor laser to simulate the red light in sunlight, especially the 650-nanometer wavelength, to irradiate the fundus to improve the blood circulation of the choroid of the fundus, promote dopamine secretion, strengthen the nutrition of fundus tissue, supplement the lack of light in the eyes, improve scleral hypoxia, relieve eye fatigue, and achieve the effect of myopia prevention and control. The relevant patent technologies are as follows:

[0005] CN112612146A discloses a far-infrared myopia prevention and control glasses, including a frame and two temples, hinges are installed on both sides of the frame, the frame is movably connected to the temples through the hinges, and two mirror rings are symmetrically arranged on the frame, and mineral raw stones are installed in the above-mentioned mirror rings. The myopia prevention and control glasses of the present invention use natural mineral raw stones, and the special internal structure of the natural mineral raw stones makes it a good far-infrared energy storage unit. The natural mineral raw stones can absorb, store and continuously release far-infrared and negative ions, and can continuously release 8 to 14 microns of far-infrared rays at a power of 0.91, acting on the eyes, promoting blood circulation and urging the ciliary muscles to relax, eliminating visual fatigue, thereby preventing and controlling myopia; the material is harmless to the human body, does not contact the eyes, and has no negative impact on the eyes.

[0006] CN115671572A discloses an adjustable infrared light-feeding device for myopia prevention and control, characterized in that it includes: a lens, a lens barrel, a lens seat, a light-blocking plate, and a mounting clip; a mounting hole is provided on the light-blocking plate, and the lens seat is mounted on the mounting hole; the lens barrel is mounted on the lens seat, and the lens is mounted at the head end of the lens barrel; the mounting clip is mounted on the lower end of the light-blocking plate; the lens barrel includes: a fisheye lens, a negative lens, a light limiter, and a narrow-band filter; the fisheye lens, the negative lens, the light limiter, and the narrow-band filter are sequentially mounted on the inner wall of the lens barrel from the tail end to the head end of the lens barrel. The present invention can filter natural light into infrared light, so that when glasses are used and the device is clamped on the glasses, the glasses can be supplemented with infrared light. When the use is completed, the device can be directly removed from the glasses, which is convenient to install and disassemble, and avoids the risk of laser damage to the fundus, is not limited by time and place, and has a reduced cost.

[0007] Although red light therapy devices can promote blood circulation, relax ciliary muscles, and eliminate visual fatigue, they still have certain defects. For example: First, it is mainly suitable for low myopia. For people with high myopia or poor vision, it may not achieve good results. They still need long-term glasses to correct their vision, and its efficacy has certain limitations. Secondly, the light-feeding device needs to be irradiated and used many times. The continuous treatment cost is relatively high, which will bring certain economic pressure to patients and make it difficult to popularize. Third, due to the short production and clinical use time of the light-feeding device, the semiconductor laser used is not natural sunlight after all. There is still a lack of rich clinical data on its long-term use and safety to the fundus. Therefore, its safety remains to be observed, and some patients are prone to eye discomfort when using it, so it cannot be promoted and applied. Fourth, the current short-term clinical trial results and relevant expert consensus all point out that the light-feeding device has a certain preventive and control effect on myopia, but its mechanism of action has not been fully elucidated, and its long-term safety remains to be studied and observed. The light-feeding device needs to strictly control the energy of red light, because high-energy red light is harmful to the retina, and low-energy red light has the effect of delaying myopia. Therefore, if the red light energy control of the light-feeding device is unstable, it will cause extremely serious damage to the retina. Related cases have been reported in clinical practice.

[0008] The method of adding natural mineral raw stones to the lens to continuously release far infrared rays can theoretically promote blood circulation, relax the ciliary muscles, and eliminate visual fatigue. However, the actual application effect is unknown and the safety is unproven. In addition, the existing functional lenses only block and absorb harmful light, and there is no report on the technology of converting harmful light into beneficial red light for use.

[0009] Therefore, how to effectively utilize the red light and harmful light of natural sunlight while wearing vision correction glasses, and use the superposition of beneficial red light to achieve continuous effects on the eyes, improve blood circulation, strengthen the nutrition of fundus tissue, supplement insufficient eye light, improve scleral hypoxia, supplement insufficient eye light, relieve visual fatigue, and actually solve the problem of eye fatigue to achieve the dual purpose of "prevention and control" of myopia. This has become a difficult problem that technicians in the field of dyeing and finishing of hemp and cotton knitted fabrics need to solve urgently. Summary of the invention

[0010] In view of the deficiencies in the prior art, the technical problem to be solved by the present invention is to provide a vision correction lens and its production process which can effectively utilize natural sunlight, rationally utilize beneficial red light, convert harmful light into beneficial red light, supplement insufficient eye light, relieve visual fatigue and myopia, absorb harmful light and enhance beneficial red light.

[0011] In order to solve the above technical problems, the technical solution adopted by the present invention is: a vision correction lens that absorbs harmful light and enhances beneficial red light, composed of the following raw materials in percentage by weight:

[0012]

[0013] The above-mentioned vision correction lens for absorbing harmful light and enhancing beneficial red light is composed of the following raw materials in percentage by weight:

[0014]

[0015] The above-mentioned vision correction lens that absorbs harmful light and enhances beneficial red light, the blue light absorber is naphthalene, the ultraviolet absorber is 2-(2'-hydroxy-5'-methylphenyl)benzotriazole, the rare earth europium compound is any one of the oxides, hydroxides, nitrates, carbonates or phosphates containing rare earth europium, and the resin material for the lens is any one of modified propionate, polycarbonate, and polyacrylic acid resin.

[0016] The above-mentioned vision correction lens that absorbs harmful light and enhances beneficial red light, the blue light absorption peak of the blue light band of the blue light absorber is 350nm-450nm.

[0017] The above-mentioned vision correction lens that absorbs harmful light and enhances beneficial red light, the maximum absorption wavelength range of the ultraviolet absorber is 270-380nm.

[0018] The above-mentioned vision correction lens that absorbs harmful light and enhances beneficial red light, the refractive index of the resin material used for the lens is 1.45-1.65.

[0019] A production process for a vision correction lens that absorbs harmful light and enhances beneficial red light, comprising the following steps:

[0020] (1) Weigh each raw material according to weight percentage, mix the raw materials and stir for 1.5 hours to obtain a mixture for later use;

[0021] (2) After the mixture was left to stand for 1.5 hours, it was evacuated for 0.5 hours;

[0022] (3) adding the mixture into a mold and heating it for a curing process;

[0023] (4) Then open the mold, trim and clean;

[0024] (5) Continue heating to perform secondary curing;

[0025] (6) Then clamp, harden and inspect;

[0026] (7) Perform hardening and curing treatment;

[0027] (8) Perform coating treatment to obtain a vision correction lens that absorbs harmful light and enhances beneficial red light.

[0028] In the production process of the above-mentioned vision correction lenses that absorb harmful light and enhance beneficial red light, in the step (3), the heating and curing treatment temperature is 120 degrees and the reaction time is 21.5 hours.

[0029] In the production process of the above-mentioned vision correction lenses that absorb harmful light and enhance beneficial red light, in the step (5), the heating temperature for secondary curing is 110 degrees and the reaction time is 4 hours.

[0030] In the above-mentioned production process of the vision correction lens that absorbs harmful light and enhances beneficial red light, in the step (7), the hardening and curing treatment temperature is 110 degrees and the reaction time is 4 hours.

[0031] The advantages of the vision correction lens and its production process of the present invention that absorb harmful light and enhance beneficial red light are as follows: in view of the defects existing in the existing light-absorbing instrument technology, a method for preparing glasses lenses using rare earth europium compound Eu 2+ and modified propionate as raw materials for light conversion is provided. This product can enhance the red light (620-690nm) in natural light and absorb harmful light in the purple to blue light region, which has much less negative effects than semiconductor lasers. It has certain effects on low, medium and high myopia and can solve the problem of vision correction at the same time. The cost is much lower than that of the existing light-absorbing instrument and will not bring economic pressure to consumers. The process method is simple in technology, does not produce any harmful substances, is green and environmentally friendly, and significantly reduces the use cost of people with vision correction who need to supplement red light. At the same time, the light conversion glasses lenses prepared by the method have mild red light supplement, can be used for a long time, have no side effects, and achieve continuous red light supplement effect while correcting vision, which is more conducive to eye fatigue relief and nutritional supplement, and has good economic benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 This is a distribution diagram of the wavelength range of beneficial light and harmful light in natural sunlight;

[0033] Figure 2 This is the excitation and emission spectrum of rare earth europium compounds;

[0034] Figure 3 The excitation and emission spectra of the independent europium compound are compared with the emission spectra of the lens with europium compound added but without blue light absorber and ultraviolet absorber added;

[0035] Figure 4The excitation and emission spectra of the europium compound are compared with the emission spectrum of the lens 2 prepared by adding 0.1% europium compound, 0.5‰ to 3‰ blue light absorber, and no ultraviolet absorber;

[0036] Figure 5 The excitation and emission spectra of the independent europium compound are compared with the emission spectrum of the lens 3 prepared by adding 0.5% of the europium compound, 0.5% to 1.5% of the ultraviolet absorber, and no blue light absorber;

[0037] Figure 6 It is a comparison diagram of the excitation and emission spectra of the independent europium compound and the emission spectrum of the lens 4 with the addition of 0.1% europium compound, 1‰ to 3‰ blue light absorber, and 0.5% to 1.5% ultraviolet absorber. DETAILED DESCRIPTION

[0038] The present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0039] In the present invention, unless otherwise stated, directional words such as "upper" and "lower" generally refer to the upper and lower parts of the device in actual use or working state, specifically the drawing direction in the attached drawings; while "inside" and "outside" refer to the outline of the device. In addition, in the description of this application, the term "including" means "including but not limited to". The terms first, second, third, etc. are used only as labels and do not impose numerical requirements or establish an order. The term "plurality" means "two or more".

[0040] A vision correction lens capable of absorbing harmful light and enhancing beneficial red light, comprising the following raw materials in percentage by weight: 0.5‰-3‰ blue light absorber; 0.5%-1.5% ultraviolet absorber; 0.1%-1% rare earth europium compound; 1%-3% epoxy resin; and the remainder being resin material for the lens.

[0041] Among them, the blue light absorber is naphthalene, the ultraviolet absorber is 2-(2'-hydroxy-5'-methylphenyl)benzotriazole, the rare earth europium compound is any one of the oxides, hydroxides, nitrates, carbonates or phosphates containing rare earth europium, and the resin material for the lens is any one of modified propionate, polycarbonate, and polyacrylic resin.

[0042] The blue light absorption peak of the blue light absorber is 350nm-450nm. The maximum absorption wavelength range of the ultraviolet absorber is 270-380nm. The refractive index of the resin material for the lens is 1.45-1.65.

[0043] The production process of the vision correction lens comprises the following steps:

[0044] (1) Weigh each raw material according to weight percentage, mix the raw materials and stir for 1.5 hours to obtain a mixture for later use;

[0045] (2) After the mixture was left to stand for 1.5 hours, it was evacuated for 0.5 hours;

[0046] (3) adding the mixture into a mold and heating it for a curing process;

[0047] (4) Then open the mold, trim and clean;

[0048] (5) Continue heating to perform secondary curing;

[0049] (6) Then clamp, harden and inspect;

[0050] (7) Perform hardening and curing treatment;

[0051] (8) Perform coating treatment to obtain a vision correction lens that absorbs harmful light and enhances beneficial red light.

[0052] Wherein, in step (3), the heating temperature for the primary curing treatment is 120 degrees, and the reaction time is 21.5 hours. In step (5), the heating temperature for the secondary curing treatment is 110 degrees, and the reaction time is 4 hours. In step (7), the hardening curing treatment temperature is 110 degrees, and the reaction time is 4 hours.

[0053] like Figure 1 As shown in the figure, natural light is divided into UVA, UVB and UVC according to different wavelengths. Among them, UVA and UVB pose a threat to human health. Long-wave ultraviolet rays (UVA): The wavelength is 315-380, accounting for about 8% of the total amount of all light directed to the earth's surface, which can cause the skin to tan and be prone to cataracts. Medium-wave ultraviolet rays (UVB): The wavelength is 280-315, accounting for about 2% of the total amount of all light directed to the earth's surface, which can cause erythema on the skin and easily cause keratitis and skin cancer. Short-wave ultraviolet rays (UVC): The wavelength is 280-10. When the sun radiates the earth, this part of the ultraviolet rays can be completely absorbed by the ozone in the earth's outer atmosphere, so it cannot radiate to the earth's surface and is harmless to the human body. Among the blue light with a wavelength of 385-505nm, the beneficial blue-green light (445-505nm) can improve mood, enhance cognitive ability and regulate sleep cycles; the harmful blue-violet light (385-445nm) is the light that causes the greatest damage to the retina. Therefore, reducing harmful blue light and converting harmful blue light into red light that is beneficial to the eyes is the core concept of the present invention.

[0054] The present invention is based on the inventive concepts of "waste utilization" and "turning harm into benefit". By adding a certain proportion of anti-blue light additives, it can better absorb and convert harmful light in the purple light to the blue light area, greatly improving the conversion efficiency, thereby enhancing the beneficial red light and improving the light-filling effect on the fundus. Converting harmful light into beneficial light not only reduces the damage of harmful light in natural light to the eyes, but also enhances the intensity of beneficial red light. The mass production of myopia lenses and hyperopia lenses can be achieved through the eyeglass lens production process.

[0055] At the same time, since the truly harmful short-wave blue light is mainly blue light with a wavelength of 400 to 440nm, it has relatively high energy. Harmful blue light exists in large quantities in the light of computer monitors, fluorescent lamps, mobile phones, digital products, display screens, LEDs, etc., and nowadays, LED backlights are used in LCD screens. Harmful blue light has extremely high energy and can penetrate the lens directly to the retina, causing atrophy or even death of retinal pigment epithelial cells. Long-term exposure to harmful blue light will cause the eyeball to be in a state of tension for a long time, causing visual fatigue. Therefore, the lens of the present invention can also convert harmful blue light when using electronic products, and it is separated from the principle of enhanced red light of sunlight, and can still effectively reduce blue light damage, and convert harmful blue light into beneficial red light, so it can also play a continuous supplementary eye light effect indoors or in places without sunlight, such as daily work and study, and achieve all-weather protection for the eyes.

[0056] The present application is described in detail below through specific embodiments. The following embodiments are only partial embodiments of the present application and are not limitations of the present application.

[0057] Example 1

[0058] A vision correction lens that absorbs harmful light and enhances beneficial red light, characterized in that it is composed of the following raw materials in percentage by weight: 0.5‰ blue light absorber; 0.5% ultraviolet absorber; 0.1% rare earth europium compound; 1% epoxy resin; the remainder is resin material for the lens. The blue light absorber is naphthalene, the ultraviolet absorber is 2-(2′-hydroxy-5′-methylphenyl)benzotriazole, the rare earth europium compound is europium oxide, and the resin material for the lens is modified propionate. The blue light band absorption peak of the blue light absorber naphthalene is 350nm-450nm. The maximum absorption wavelength range of the ultraviolet absorber 2-(2′-hydroxy-5′-methylphenyl)benzotriazole is 270-380nm. The refractive index of the modified propionate is 1.45-1.65.

[0059] The production process of the vision correction lens for absorbing harmful light and enhancing beneficial red light of the present invention comprises the following steps:

[0060] (1) Weigh each raw material according to weight percentage, mix the raw materials and stir for 1.5 hours to obtain a mixture for later use;

[0061] (2) After the mixture was left to stand for 1.5 hours, it was evacuated for 0.5 hours;

[0062] (3) adding the mixture into a mold and heating it for curing at a temperature of 120 degrees for 21.5 hours;

[0063] (4) Then open the mold, trim and clean;

[0064] (5) Continue heating for secondary curing treatment, the heating temperature for secondary curing treatment is 110 degrees, and the reaction time is 4 hours;

[0065] (6) Then clamp, harden and inspect;

[0066] (7) Perform hardening and curing treatment at a temperature of 110 degrees and a reaction time of 4 hours;

[0067] (8) Perform coating treatment to obtain a vision correction lens that absorbs harmful light and enhances beneficial red light.

[0068] Example 2

[0069] A vision correction lens that absorbs harmful light and enhances beneficial red light, composed of the following raw materials in percentage by weight: 1‰ blue light absorber; 1% ultraviolet absorber; 0.5% rare earth europium compound; 2% epoxy resin; the remainder of lens resin material. Among them, the blue light absorber is naphthalene, the ultraviolet absorber is 2-(2′-hydroxy-5′-methylphenyl)benzotriazole, the rare earth europium compound is europium phosphate, and the lens resin material is polycarbonate. The blue light band absorption peak of the blue light absorber naphthalene is 350nm-450nm. The maximum absorption wavelength range of the ultraviolet absorber 2-(2′-hydroxy-5′-methylphenyl)benzotriazole is 270-380nm. The refractive index of polycarbonate is 1.45-1.65.

[0070] The method for preparing the vision correction lens in this embodiment is the same as that in Embodiment 1, so it will not be described in detail.

[0071] Example 3

[0072] A vision correction lens that absorbs harmful light and enhances beneficial red light, composed of the following raw materials in percentage by weight: 3‰ blue light absorber; 1.5% ultraviolet absorber; 1% rare earth europium compound; 3% epoxy resin; the remainder is resin material for lenses. Among them, the blue light absorber is naphthalene, the ultraviolet absorber is 2-(2′-hydroxy-5′-methylphenyl)benzotriazole, the rare earth europium compound is europium hydroxide, and the resin material for lenses is polyacrylic resin. The blue light band absorption peak of the blue light absorber naphthalene is 350nm-450nm. The maximum absorption wavelength range of the ultraviolet absorber 2-(2′-hydroxy-5′-methylphenyl)benzotriazole is 270-380nm. The refractive index of polycarbonate is 1.45-1.65.

[0073] The method for preparing the vision correction lens in this embodiment is the same as that in Embodiment 1, so it will not be described in detail.

[0074] The performance test results of the different component addition ratios of the vision correction lens for absorbing harmful light and enhancing beneficial red light of the present invention are as follows:

[0075] The functions of the additives added in the present invention in the lens are as follows:

[0076] 1. Blue light absorber, naphthalene: a nitrogen-containing alicyclic compound with a molecular formula of C 10 H8N2, with an absorption peak between 350nm and 450nm, can absorb the blue-violet light in this band of natural sunlight that is harmful to the eyes, preparing for light conversion.

[0077] 2. The chemical formula of UV absorber 2-(2′-hydroxy-5′-methylphenyl)benzotriazole (UV-P) is C 13 H 11 N3O, with a molecular weight of 225.3, is a white to light yellow crystalline powder, with a melting point between 128-132°C and a maximum absorption wavelength range of 270-380nm. It can absorb ultraviolet rays in this band of natural sunlight that are harmful to the eyes, preparing for light conversion. It has low toxicity and super ultraviolet absorption ability, which can effectively prevent ultraviolet rays from aging the lens and improve the anti-aging performance of the lens.

[0078] 3. Rare earth europium compounds. The present invention can use europium oxide, europium hydroxide, europium nitrate, europium carbonate or europium phosphate. Rare earth europium compounds with Pnma structure can convert the purple to blue light in sunlight into bright red light, wherein the emission spectrum range is (600-700nm). At the same time, the blue light absorber and the ultraviolet light absorber are absorbed into the lens, and the blue-violet light and ultraviolet light are further converted into red light. On the basis of the beneficial red light passing through the lens, the beneficial red light is superimposed, thereby enhancing the irradiation of the eye with red light.

[0079] 4. Epoxy resin. Its role in the lens of the present invention is to mix and fuse the powdered blue light absorber, ultraviolet absorber, rare earth europium compound and liquid lens resin material evenly after the raw materials are mixed, so as to ensure the overall light absorption and conversion performance of the lens; and it can ensure the basic properties of the lens such as light transmittance, refractive index, hardness, strength, etc. while increasing the light absorption and conversion functions, and ensure the basic optical properties, physical properties and chemical properties of the lens.

[0080] 5. Resin materials for lenses: modified propionate, polycarbonate, and polyacrylic resin are all common raw materials for lenses at present, and can be selected and used according to the basic requirements and actual needs of the lenses.

[0081] Regarding the amount of each raw material and the synergistic effect, first of all, the addition of blue light absorbers can easily cause the lens to turn yellow as a whole, affecting the transmittance of the lens. While giving the lens the function of absorbing blue and purple light, in order to avoid the lens from turning yellow, the addition of ultraviolet absorbers can inhibit the problem of blue light absorbers causing the lens to turn yellow. Therefore, ultraviolet additives can not only absorb the ultraviolet rays of this band in natural sunlight that are harmful to the eyes, but also improve the problem of blue light absorbers causing the lens to turn yellow. Secondly, the rare earth europium compound plays a conversion role in the present invention, and further adding anti-blue light additives is intended to better achieve absorption and conversion. The principle is: compared with not adding absorbers, adding blue light absorbers and ultraviolet absorbers can provide more blue and purple light and ultraviolet rays for the lens, increasing the conversion amount of rare earth europium compounds to beneficial red light, thereby enhancing the red light irradiation effect. Third, in order to ensure the overall refractive index and imaging effect of the lens, and to avoid the large difference in refractive index between the rare earth europium compound and the resin material for the lens affecting the refractive index and imaging of the lens, the refractive index of the two raw materials needs to be close to or consistent. According to our research, when the refractive index of the rare earth europium compound of Pnma structure is n=1.47, the refractive index n of the two substances is almost the same when dispersed in the resin material for lenses. Therefore, after mixing, the total reflection is relatively small, and it has a good refractive index and imaging effect.

[0082] like Figure 2 As shown, this product mainly adjusts the formula of the raw materials for lens production to absorb harmful purple light in sunlight to the blue light region, convert the wavelength, and emit more red light that is beneficial to the eyes. From the excitation and emission spectra of europium compounds, it can be seen that they have excellent light conversion performance. Therefore, the present invention can prove that the lens has good light conversion performance by adding rare earth europium compounds.

[0083] like Figure 3As shown, from the excitation and emission spectra of the independent europium compound and the emission spectrum comparison chart of the lens 1 with europium compound added but without blue light absorber and ultraviolet absorber added, it can be obtained through testing that when only europium compound is added to the lens raw material, the intensity of red light is improved, but the improvement is not large. According to the proportion, the red light intensity of the conventional lens is increased by about 5% when 0.1% of europium compound is added, and the red light intensity of the conventional lens is increased by about 8% when 1% of europium compound is added.

[0084] like Figure 4 As shown, from the excitation and emission spectra of the independent europium compound and the emission spectrum comparison chart of the lens 2 prepared by adding 0.1% europium compound, adding 0.5‰ to 3‰ blue light absorber, and no ultraviolet absorber, it can be obtained through testing that when only 0.1% europium compound is added to the lens raw material, adding 1‰ blue light absorber can achieve a 10% increase in red light intensity, adding 2‰ blue light absorber can achieve a 13% increase in red light intensity, and adding 3‰ blue light absorber can achieve a 16% increase in red light intensity.

[0085] like Figure 5 As shown, from the excitation and emission spectra of the independent europium compound and the emission spectrum comparison chart of the lens 3 prepared by adding 0.5% europium compound, adding 0.5% to 1.5% ultraviolet absorber, and not adding blue light absorber, it can be obtained through testing that when 0.5% europium compound and 0.5% ultraviolet absorber are added to the lens raw material, the red light intensity is increased by 20%, the red light intensity is increased by 1% by the ultraviolet absorber, and the red light intensity is increased by 30% by the ultraviolet absorber.

[0086] like Figure 6 As shown, from the excitation and emission spectra of the independent europium compound and the emission spectrum of the lens 4 with the addition of 0.5% europium compound, 0.5‰ to 3‰ blue light absorber, and 0.5% to 1.5% ultraviolet absorber, it can be obtained through testing that when 0.5% europium compound, 1% ultraviolet absorber, and 1‰ blue light absorber are added to the lens raw material, the red light intensity is increased by 40%. According to actual needs, the addition ratio can be adjusted to achieve a higher red light intensity increase.

[0087] In summary, the present invention utilizes blue light absorbers and ultraviolet absorbers to absorb blue-violet light in harmful bands, and utilizes rare earth europium compounds to convert blue-violet light into red light that is beneficial to the eyes. On the basis of the beneficial red light, the intensity of the red light is further enhanced, and the superposition and enhancement of the beneficial red light are achieved, taking into account both reducing the damage caused by harmful light and enhancing the irradiation effect of the beneficial red light on the eyes.

[0088] Of course, the above description is not a limitation of the present invention, and the present invention is not limited to the above examples. Any changes, modifications, additions or substitutions made by ordinary technicians in this technical field within the essential scope of the present invention should fall within the protection scope of the present invention.

Claims

1. A vision correction lens that absorbs harmful light and enhances beneficial red light, characterized in that: It is composed of the following raw materials in percentage by weight:

2. The vision correction lens for absorbing harmful light and enhancing beneficial red light according to claim 1, characterized in that: It is composed of the following raw materials in percentage by weight:

3. The vision correction lens for absorbing harmful light and enhancing beneficial red light according to claim 1 or 2, characterized in that: The blue light absorber is naphthalene, the ultraviolet absorber is 2-(2′-hydroxy-5′-methylphenyl)benzotriazole, the rare earth europium compound is any one of oxides, hydroxides, nitrates, carbonates or phosphates containing rare earth europium, and the resin material for the lens is any one of modified propionate, polycarbonate, and polyacrylic acid resin.

4. The vision correction lens for absorbing harmful light and enhancing beneficial red light according to claim 3, characterized in that: The blue light absorber has a blue light band absorption peak of 350nm-450nm.

5. The vision correction lens for absorbing harmful light and enhancing beneficial red light according to claim 3, characterized in that: The maximum absorption wavelength range of the ultraviolet absorber is 270-380nm.

6. The vision correction lens for absorbing harmful light and enhancing beneficial red light according to claim 3, characterized in that: The refractive index of the resin material for lenses is 1.45-1.

65.

7. A process for producing a vision correction lens as claimed in claims 1 to 6, characterized in that: The steps include: (1) Weigh each raw material according to weight percentage, mix the raw materials and stir for 1.5 hours to obtain a mixture for later use; (2) After the mixture was left to stand for 1.5 hours, it was evacuated for 0.5 hours; (3) adding the mixture into a mold and heating it for a curing process; (4) Then open the mold, trim and clean; (5) Continue heating to perform secondary curing; (6) Then clamp, harden and inspect; (7) Perform hardening and curing treatment; (8) Perform coating treatment to obtain a vision correction lens that absorbs harmful light and enhances beneficial red light.

8. The production process of the vision correction lens that absorbs harmful light and enhances beneficial red light according to claim 7, characterized in that: In the step (3), the heating temperature for the curing treatment is 120 degrees and the reaction time is 21.5 hours.

9. The production process of the vision correction lens that absorbs harmful light and enhances beneficial red light according to claim 7, characterized in that: In the step (5), the heating temperature for secondary curing treatment is 110 degrees and the reaction time is 4 hours.

10. The production process of the vision correction lens that absorbs harmful light and enhances beneficial red light according to claim 7, characterized in that: In the step (7), the hardening and curing treatment temperature is 110 degrees and the reaction time is 4 hours.

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