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Photochromic Lenses from China: Intelligent Photosensitive Color Change Suppliers & Factory Products
Product Video
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
How do photochromic lenses work?
Photochromic lenses contain special molecules (like silver halide or organic photochromic dyes) that undergo a chemical reaction when exposed to ultraviolet (UV) light. This reaction causes the lenses to darken to absorb light, and they automatically revert back to their transparent state once the UV source is removed.
Do photochromic lenses block UV rays?
Yes, high-quality photochromic lenses provide 100% protection against both UVA and UVB rays, helping protect your eyes from long-term sun damage even when the lenses remain clear indoors.
How fast do photochromic lenses change color?
Modern photochromic lenses darken quickly, typically reaching their darkest state within 30 to 60 seconds of stepping outdoors. The transition back to clear indoors generally takes between 2 to 5 minutes, depending on the material and ambient temperature.
Will photochromic lenses work inside a car?
Standard photochromic lenses may not darken significantly inside a car because modern windshields block the majority of UV light required to trigger the color-changing process. However, specialized active-transition lenses designed specifically for driving are available.
What materials are used in these lenses?
These lenses are manufactured using premium optical resins, acrylics, and advanced monomers like MR-7 and MR-8, which offer high refractive indices, lightweight comfort, and excellent optical clarity.