What is photochromic lenses & glasses?

what are photochromic lenses?

Photochromic lenses are lenses that become darker when exposed to a certain wavelength of light, typically ultraviolet light. In the absence of bright light, the lens returns to its clear appearance.

Photochromic lenses can be made of glass, polycarbonate, or other plastics. They are mainly used for glasses that are darker in bright sunlight and transparent in low ambient light conditions. They darken noticeably within about a minute of exposure to bright light and take longer to clear. The lenses are available in a variety of clear colors and transmittance specifications.

Discoloration principle of photochromic lenses

Generally, Photochromic lenses are made by adding a photochromic material to the glass raw material. This material has two different molecular or electronic structural states. There are two different absorption coefficients in the visible region. Under the action of light, it can change from one structure to another, resulting in reversible changes in color.

When photochromic lenses are irradiated with ultraviolet light and short-wave visible light in sunlight, their color becomes darker and the light transmittance is lowered. Light transmittance of the lens will be improved indoors or in the dark and the color of the lenses will be recovered . The photochromism of the lens is automatic and reversible.

What benefits do photochromic lenses have?

Photochromic lenses can adjust the transmittance through the discoloration of the lens so that the human eye can adapt to changes in the ambient light. That will help us reduce visual fatigue and protect the eyes. Like this one worn by IG fashion influencer @makeupntipsbym cat eye tortoise glasses with  still look stylish.
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Also, it really helps when we forget to take sunglasses if we stay outside on a sunny day!

Are photochromic lenses expensive?

It is very beneficial for people with vision problems to choose this color-changing spectacle lens, which can assist in correcting refractive errors, so is it expensive? In fact, the price of the lens is usually affected by the brand, material, region, etc., and photochromic lenses are no exception. At Vooglam you will get cheaper lenses because vooglam lenses are custom made directly from the factory. At the same time, due to the high production technology of the cooperative manufacturers, the quality of the lenses is also guaranteed and very reliable.

Vooglam custom photochromic glasses online

Vooglam offers online customization of photochromic glasses, which can also be used as power sunglasses. When choosing photochromic lenses, the store recommends a 1.61 High-Index specification, available in amber and grey. These two lens colors can prevent ultraviolet rays well, and at the same time, the damage to the glasses is relatively small. The biggest advantage of a gray lens is that the original color of the scene will not be changed by the lens, and the most satisfying thing is that it can reduce the light intensity very effectively.