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Photochromic Lens Suppliers in China - Intelligent Photosensitive Color Change from Leading Manufacturing Factory
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Data Specification
| 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 & Pros/Cons
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 & 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
What are photochromic lenses?
Photochromic lenses are optical lenses that transition from transparent to dark when exposed to ultraviolet (UV) light, and revert to their clear state once indoors or away from UV radiation.
How do photochromic lenses change color?
They incorporate photosensitive compounds (like silver halide or organic dyes). When UV rays hit these compounds, a chemical reaction occurs that alters their molecular structure, enabling them to absorb visible light and darken the lens.
What material and index options are available?
These lenses are available in refractive indices of 1.553, 1.597, and 1.667, and are crafted from high-performance materials like Resin, Acrylic, MR-7, and MR-8.
What are the main performance benefits of these lenses?
Key benefits include rapid discoloration, 100% UV protection, anti-reflection, wear resistance, high light transmittance, waterproof protection, and anti-fingerprint surface coatings.
Are there different coating options for photochromic lenses?
Yes, the lenses can be coated with HMC (Hard Multi-Coating), SHMC (Super Hard Multi-Coating), Blue Cut coating, or Green coating to enhance clarity, durability, and blue light filtration.