Views: 113 Author: Site Editor Publish Time: 2020-09-07 Origin: Site
With the development of science and technology, spectacle lenses have also been constantly introduced new styles that are more fashionable and protect eyesight. Photochromic lenses are now widely used. Photochromic polarized sunglasses, photochromic reading glasses, sports photochromic sunglasses, etc. are popular among consumers.
Photochromic lenses are spectacle lenses designed to be transparent (or almost completely transparent) indoors and automatically darken in bright outdoor conditions. In fact, they are ordinary glasses that transition to sunglasses, which can increase visibility in the absence of light. They are also known as light-adaptive lenses and variable-color lenses.
Now, contact lenses can also use photochromic technology. Now the first contact lens with light adaptability has been invented.
The molecules that darken the photochromic lens are activated by the sun's ultraviolet radiation. Since ultraviolet rays penetrate the clouds, the photochromic lenses darken on cloudy and sunny days.
Adding anti-reflective coating on the photochromic lens can further improve its performance. The AR coating allows more light to pass through the photochromic lens to obtain a clearer field of view in low light conditions (such as driving at night), and under bright conditions, it can eliminate the reflection of sunlight and other light from the back of the lens. Although photochromic lenses are more expensive than transparent spectacle lenses, the convenience they provide can reduce the need to carry prescription sunglasses with you. Photochromic lenses usually do not darken in the car because the windshield blocks most of the ultraviolet light. Recent technological advances have allowed certain photochromic lenses to be activated under both ultraviolet and visible light, thereby darkening the rear of the windshield.
Almost all lens materials and designs can use photochromic spectacle lenses, including high-index lenses, bifocal and progressive lenses. Another benefit of photochromic lenses is that they can protect your eyes from 100% harmful UVA and UVB rays.
Since a person‘s lifetime exposure to sunlight and ultraviolet light can cause cataracts later in life, it is a good idea to consider using photochromic lenses for children’s glasses and adult glasses. Polycarbonate is the safest lens material for children, and its impact resistance is 10 times that of other lens materials.
Photochromic lenses are also in the form of sunglasses. These are mainly used for outdoor wear. It can be expected that they are not really suitable for indoor use, and will not be as clear as ordinary photochromic lenses. They are designed to provide extra eye protection and vision for people who must often work in the sun, entertain or ride bicycles and other sports activities. They are also suitable for long-distance driving.
In order to meet more driving needs, a type of photochromic lens was invented. These lenses are polarized refractive adaptive lenses specially made for use behind the steering wheel. They are designed to be darker and clearer when the light in the car changes. They enhance contrast and improve driving clarity.
The invention of photochromic lenses has brought us a better visual experience. Especially for people who work outdoors, wearing photochromic lenses sunglasses or photochromic reading glasses, can better block the damage of ultraviolet rays to the eyes.
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