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China Photochromic Lens Suppliers - Intelligent Photosensitive Color Change Factory for UV Protection
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Data
| Product | Photochromic lens | Index | 1.553 / 1.597 / 1.667 |
| Material | Resin / Acrylic / MR-7 / MR-8 | Abbe Value | 34 / 42 / 32-33 |
| Diameter | 65 / 70 / 72 / 75 | Coating | HMC / SHMC / Blue / Green |
Performance
Rapid discoloration
UV protection
Anti reflection
Wear resistance
High transmittance
Waterproof
Anti-fingerprint
Principle
The color changing effect of photochromic lens is based on the principle of reversible reaction between light and color. When there is no ultraviolet light irradiation, silver halide or other photosensitive substances inside the lens are transparent to visible light; When exposed to ultraviolet light, these substances undergo a chemical reaction, absorbing some visible light and causing the lens to darken. After the light source disappears, these chemical reactions are reversible and the lens will return to its original transparent state.
Manufacturing Materials and Techniques
Photochromic lenses typically use photosensitizers such as silver halide, silver barium oxide, copper halide, and chromium halide. These substances undergo chemical reactions under ultraviolet radiation, causing the lenses to change color. With the development of technology, modern color changing lenses increasingly use organic photochromic dyes, such as spiropyran compounds, which have better photoresponsiveness and can achieve faster color changing speeds.
Application Scenarios and Advantages and Disadvantages
Photochromic lens are suitable for both indoor and outdoor use, as they can block strong light and ultraviolet rays, reducing damage to the eyes. Its advantages include automatic adjustment of transparency, reduction of visual fatigue, and protection of the eyes. The disadvantage is that the speed and uniformity of color change may vary depending on the technology, and film layer color change technology is usually faster than substrate color change technology.
Historical Background and Development Trend
The history of photochromic lenses can be traced back to the 1940s, with glass lenses being used in the early days and gradually developing to use organic photochromic dyes. With the advancement of technology, modern color changing lenses not only innovate in materials and technology, but also provide more color choices and functions, such as anti blue light, etc.
Frequently Asked Questions
Q: How do photochromic lenses work?
Photochromic lenses work on the principle of a reversible reaction between light and color. When exposed to ultraviolet light, photosensitive substances inside the lens (like silver halide or organic dyes) undergo a chemical reaction that absorbs visible light and darkens the lens. Once the UV light disappears, the reaction reverses, and the lens becomes transparent again.
Q: What materials are used in manufacturing photochromic lenses?
Traditionally, photosensitizers like silver halide, silver barium oxide, copper halide, and chromium halide were used. Modern photochromic lenses increasingly utilize organic photochromic dyes, such as spiropyran compounds, for faster and more responsive color-changing performance.
Q: What are the key advantages of using photochromic lenses?
The main advantages include automatic adjustment of transparency based on lighting conditions, significant reduction of visual fatigue, protection against strong glare, and reliable UV protection for the eyes.
Q: Are there any disadvantages to photochromic lenses?
The speed and uniformity of the color change can vary depending on the technology used. For instance, film layer color change technology typically performs faster than substrate color change technology.
Q: What are the historical origins and modern trends of these lenses?
Photochromic lenses date back to the 1940s, starting with glass lenses and transitioning to organic photochromic dyes. Modern trends focus on material and technology innovations, offering more color options and additional integrated features like anti-blue light protection.