Photochromic Lenses
Evolution of Photochromic Lenses

The first commercially viable plastic photochromic lens was introduced by Transitions in 1990. These lenses utilize a �surface� technology, in which the dyes are imbibed into the front surface of clear plastic lenses. From generation to generation, this technology has steadily evolved. The latest surface technology products are the result of a fourth generation change in technology.

Late in 1999, Corning developed a new in-mass plastic lens technology, marketed under the brand SunSensors�.

Evolution of Photochromic Lenses
1991	Transitions® developes "imbibed" photochromic technology for plastic lenses
1990's	Several improvements in imbibed technology
1999	Corning developes new in-mass plastic lens technology
2002	Fourth generation imbibed technology launched

 

Photochromic refers to a technology not a material
It is important to note that the term �photochromic� refers to a technology not a lens material. Because photochromics were only available in glass until the early 1990�s, there may be a common misperception that they are not available in other materials. This is not true. In addition to regular and hi-index glass, they are also available in regular, mid-index and hi-index plastic as well as polycarbonate. And the beat goes on. Today, the quality and performance of photochromic lenses continues to evolve as companies focus more attention and dollars on research and development efforts.

Photochromic lenses also are now available in a variety of colors. Add to this the availability of photochromic lenses in new materials, and dispensers and their patients have a veritable cornucopia of photochromic lens materials to choose from.