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China Suppliers Factory Photochromic Lenses: Intelligent Photosensitive Color Change Technology
Product Video
Specifications & 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 & Pros & Cons
Photochromic lenses 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
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
How do photochromic lenses work?
Photochromic lenses contain photosensitive substances (such as silver halide or organic dyes) that undergo a reversible chemical reaction when exposed to ultraviolet (UV) light, absorbing visible light and causing the lenses to darken. They return to a transparent state once the UV light source is removed.
What materials are used to make these lenses?
They are commonly manufactured using high-quality resin, acrylic, MR-7, or MR-8. Modern versions utilize organic photochromic dyes like spiropyran compounds to achieve faster response and transitions.
What are the main advantages of photochromic lenses?
They offer automatic light adjustment, reduction of visual fatigue, robust UV protection, and are highly versatile for both indoor and outdoor activities.
Are there differences in color-changing speed?
Yes, the speed and consistency of the transition depend on the manufacturing technology. Film layer color change technology generally transitions faster than traditional substrate color change methods.
What other features do modern photochromic lenses offer?
In addition to light adaptation and UV defense, modern photochromic lenses can integrate features like anti-blue light protection, anti-reflection, scratch resistance, and water/fingerprint repelling coatings.