Abstract

The discovery of a system based on silver halide crystallites suspended in an inorganic glass matrix resulted in the development of the first commercially acceptable photochromic lenses¹,². The convenience of having lenses that darken automatically upon exposure to sunlight has proven to be appealing to eyeglass wearers. An estimated 10 million pairs of silver-based photochromic prescription lenses were dispensed in the United States in 1989³.

© 1992 Optical Society of America