1 December 1991 Plastic photochromic eyewear: a status report
Author Affiliations +
An estimated 10 million pairs of photochromic prescription lenses were dispensed in the United States in 1989, essentially all based on a silver halide system suspended in an inorganic glass. A significant trend within the ophthalmic industry has been the growth of light-weight plastic lenses. In the United States market, the percentage of prescription eyewear made of plastic is now greater than 70%. With this increasing market penetration of plastic lenses, the desire for an acceptable plastic photochromic lens has also increased. As with any commercial product, in order to achieve consumer acceptance there exist several technical requirements for a plastic photochromic lens. These include the light transmission and color of the lens in both the unactivated and activated states, the speeds of darkening and fading, and the fatigue resistance or lifetime of the photochromic system. These requirements will be defined along with approaches to achieving them. The properties of the commercially available plastic photochromic lenses will be compared with the defined requirements.
© (1991) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
John C. Crano, John C. Crano, Richard C. Elias, Richard C. Elias, "Plastic photochromic eyewear: a status report", Proc. SPIE 1529, Ophthalmic Lens Design and Fabrication, (1 December 1991); doi: 10.1117/12.50486; https://doi.org/10.1117/12.50486


Plastic substrate hardening by PE-CVD
Proceedings of SPIE (September 06 1994)
Bendable Silver-Based Low Emissivity Coating On Glass
Proceedings of SPIE (November 11 1987)
Smart polymer-coated hollow fibers
Proceedings of SPIE (April 20 1999)

Back to Top