PhotoChromics

Photochromic lenses change color when exposed to light (specifically, when exposed to UltraViolet light). In the early 1990s, plastic photochromic lenses were created (until then, photochromic lenses were only available in glass) by a company named Transitions. You have probably seen advertising by Transitions, Inc., which demonstrates the lenses' ability to change colors in different lighting conditions. Transitions lenses change color via a chemical coating which is impregnated within the lens. When exposed to sufficient UV light, this coating darkens the lens to a light sunglass tint. At night and indoors, the lens lightens to an almost clear color.
Although the standard Transitions lens is not intended to be a replacement for sunglasses, millions of pairs have been dispensed to patients desiring some glare protection. Many people do not realize that Transitions is available in a form called "Transitions Xtra." This lens gets quite dark- but does not completely lighten (the lens still blocks 20% when lightened). Transitions are also now available in a brown color (as well as "Splitz" Transitions- which are available in lots of color combinations). Transitions lenses have seen many improvements since their introduction a decade ago. Today's lenses get darker, change faster, and darken to a truer gray color (early lenses turned blue). Adding Transitions to a pair of lenses generally costs between $60-80 (this price includes UV and scratch coatings, so there will be no additional coatings to purchase). Visit The Eyesite for a demonstration!