What are chameleon glasses?
What are chameleon glasses?
Points that are often called in the common people"Chameleons", are known for a long time. In the bright sun, the lenses of such glasses darken, turning into an excellent protection for the eyes, in the room they look like ordinary.
What does photochromic glasses mean?
Modern "chameleon glasses" is commonly calledphotochromic. Such glasses tend to darken and brighten depending on the intensity of ultraviolet radiation or light flux. Such a change in the color of the lens protects the eyes from excess sunlight in the same way as sunglasses. Photochromic lenses in the room can not be distinguished from the usual ones, because visually they look absolutely alike. Changes in the color of lenses are explained by the presence in their composition of photochromic substances that react to the action of ultraviolet radiation. When such beams enter the photochromic lenses, they go into the active state. At the same time, they pass fewer rays of visible light. In this condition, the lens acquires a dark brown or dark gray color. Photochromic lenses are also known which are manufactured by applying photochromic coating to the surface of the lens, but in recent years such a technology is rarely used.How to distinguish an odd job
However, it is worth remembering that there is a hugethe number of fakes in this area. As a rule, at first glance, it is almost impossible to distinguish them. Although, if you are attentive to their characteristics, it is quite possible. First of all, you need to put on your glasses and look around. The quality photochromic glasses never distort light, but only a little it is muffled. In addition, the quality lens on the cut has a dark rib, and not a light one. If the edge is light, this indicates that the lens is simply coated, which after a while will be erased. But the most important thing is that the lens does not darken when brought to an artificial light source. A quality lens should only react to sunlight.Differences in degrees of dimming
When choosing "chameleons" you should know thatthe degree of their dimming is different, so you should carefully choose it. As a rule, for most women, the degree of darkening is from 10 to 55%. It assumes a sufficiently weak obscuration. For men, a darkening of 15 to 65% is recommended. Most often these glasses are gray. People with increased photosensitivity are best suited for lenses with a blackout of up to 85%. Overall, photochromic lenses are now among the most popular and have the best optical properties. They really allow you to replace two pairs of glasses (simple and sunscreen) one - with photochromic lenses.
