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China Photochromic Lens Suppliers - Intelligent Photosensitive Color Change Technology from Trusted Factory
Product Video
Technical 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 Features
Rapid discoloration
UV protection
Anti reflection
Wear resistance
High transmittance
Waterproof
Anti-fingerprint
Working 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 & 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 & Advantages
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 & Trends
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 change color?
Photochromic lenses contain photosensitive substances like silver halide or organic dyes. When exposed to ultraviolet (UV) light, these substances undergo a reversible chemical reaction that causes the lens to darken and absorb light. When the UV light source is removed, the reaction reverses, returning the lens to its transparent state.
Q: What materials are used to manufacture these lenses?
These lenses are made from high-quality materials including Resin, Acrylic, MR-7, and MR-8. They incorporate photosensitizers such as silver halide, copper halide, or advanced organic photochromic dyes like spiropyran compounds for faster transitions.
Q: What are the main performance benefits of photochromic lenses?
Key performance benefits include rapid discoloration, full UV protection, anti-reflection, wear resistance, high light transmittance, waterproof properties, and anti-fingerprint surface protection.
Q: What are the refractive index options available?
The lenses are available in multiple refractive indexes to suit different prescription strengths: 1.553, 1.597, and 1.667.
Q: What is the difference between film layer and substrate color-changing technologies?
The speed and uniformity of the transition depend on the technology used. Film layer color change technology generally transitions faster and more uniformly compared to traditional substrate-based color change technology.