Modern self-tinting lenses, like ZEISS PhotoFusion, can be useful in all light conditions. They make seeing less strenuous and more comfortable, while also offering your eyes 100% UV protection and meeting all your fashion needs. Let us show you who should getphotochromic prescription eyeglass lenses and in which vision situations they can offer real added value.
A small but significant invention by chemist Stanley Donald Stookey and his colleague William Armistead in the 1960s made it possible to manufacture prescription eyeglass lenses which react to UV rays. Now, high-performance self-tinting lenses are available, such as ZEISS PhotoFusion, which become as dark as sunglasses very quickly, and become totally clear indoors. ZEISS prescription eyeglass lenses with PhotoFusion offer 100 percent protection against harmful UV-A and UV-B rays, as well as pleasant, natural and contemporary color tints. Despite this, many eyeglass wearers are reluctant to wear self-tinting, or photochromic, prescription lenses, because they believe that the prescription lenses do not adapt the tint to the light conditions fast enough. The image factor can also play a negative role as many eyeglass wearers find self-tinting lenses old-fashioned and frumpy.
There can be major differences in the quality and performance of self-tinting lenses. Ask your eye care professional about the performance of self-tinting lenses:
In November 2012, Carl Zeiss Vision conducted a study of eyeglass wearers** who tested PhotoFusion. 9 out of 10 wearers rated the quality of PhotoFusion as very good or good. 4 out of 5 were very satisfied or satisfied with PhotoFusion. And, as many as 83% would recommend prescription eyeglass lenses with ZEISS PhotoFusion to their friends and colleagues.
*Average value for 1.67 and 1.6 and prescription eyeglass lenses made of polycarbonate. Performance varies according to material, temperature and the light conditions.
**Source: Independent consumer study, Germany, November 2012
***UV rays are divided into three categories, of which only UV-A and UV-B rays reach the earth's surface. The short-wave, energy-rich UV-C rays (100 to 280 nm) are absorbed almost fully in the earth's atmosphere. When we refer to UV rays, we only mean the UV-A and UV-B rays which reach the earth. The UV-A and UV-B rays are absorbed by the eyes at varying degrees.
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