Modern self-tinting lenses, like ZEISS PhotoFusion, can be a loyal and useful partner for all light conditions in your life. 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 for whom and in which vision situations photochromic prescription spectacle lenses 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 spectacle 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 spectacle lenses with PhotoFusion offer 100 per cent protection against harmful solar UV-A and UV-B rays and pleasant, natural and modern colour tints. In spite of this, many spectacle wearers are reluctant to wear self-tinting, or photochromic, prescription spectacle lenses, as they believe that the prescription spectacle lenses do not adapt the tint to the light conditions fast enough. The image factor can also play a negative role as many spectacle wearers find self-tinting lenses looking old-fashioned and frumpy.
There can be major differences in the quality and performance of self-tinting lenses. Ask your optician about the performance of self-tinting lenses:
In November 2012, Carl Zeiss Vision conducted a study with spectacle wearers** who tested PhotoFusion. 9 out of 10 spectacle wearers rated the quality of PhotoFusion as very good or good. 4 of 5 of the surveyed spectacle wearers were very satisfied or satisfied with PhotoFusion. And as many as 83% would recommend prescription spectacle lenses with ZEISS PhotoFusion to their friends and colleagues.
*Average value for 1.67 and 1.6 and prescription spectacle 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 solar 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 to different degrees.
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