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ZEISS Self-tinting Lenses

Optical Knowledge

Here you get background information on spectacle lenses: Basics of ophthalmic optics, surface geometry and progressive lenses, lens materials, lens production and coatings.



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Self-tinting Lenses by ZEISS

Comfortable vision in any light condition

The characteristic feature of photochromic lenses is that they become steadily darker on increasing exposure to UV radiation and clear again when the radiation decreases. Photochromic lenses adapt to changing light conditions and hence provide optimum protection against glare in almost any situation. Due to the time required for the photochromic substances to react, however, protection cannot be guaranteed against sudden glare.

Influence on the darkening

Influence on the darkening

Photochromic lenses can be made of glass or plastic. Their darkening and clearing process is dependent on ambient temperature and on the intensity of the UV radiation to which they are exposed. The higher the intensity of the radiation and the lower the temperature, the darker the lens and the faster the darkening process.

This means that maximum darkening is achieved in wintry conditions in mountainous regions. The lenses become slightly less dark in summer heat. Maximum darkening is not possible in motor vehicles, as the windscreen absorbs UV radiation.



High-tech Product

ZEISS scientists and engineers have responded to consumer expectations on self-tinting lenses by refining this technology to create PhotoFusion®. The lenses represent a genuine improvement in comfort for the wearer.

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ZEISS recommends PhotoFusion® as a self-tinting solution for lenses. Transitions® lenses are also available.


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