Transitions Technology offers the most advanced photochromic properties for ophthalmic lenses. It adapts to all light conditions and provides 100% protection against harmful UV radiation. When a lens with Transitions technology is exposed to ultraviolet light, the photochromic molecules change their structure, causing the lens to darken. All lenses with photochromic reactions (self-darkening) have a photochromic film on their surface. The superiority of Transitions technology lies in its exclusive patents, which control the darkening of the lens by changes in the surrounding light.

The lenses become dark or light to the appropriate degree so that the optimal amount of light always reaches the eye. However, ambient temperature can affect the speed of the molecules' reaction. When the lens cools, the molecules move more slowly, which can further delay the transition from dark to clear. When the lens is heated, the molecules speed up and become more active, making the reaction significantly faster.

Suppose the lens is exposed to a warm sunny day while in the shade, the Transitions lens will not register UV radiation and will remain clear until it is exposed to UV radiation again. If the lens is exposed to a cold sunny day and then moves into the shade (away from UV radiation), the lens will adapt more slowly compared to warm weather conditions. Transitions scientists are continually working to improve the technology and create formulations that find the perfect balance between UV radiation and lens temperature.