Photochromatic lens products are made to darken when exposed to high intensity light (Ultra-Violet Rays), and lighten up when removed from that light source.
The current advertising for this product portrays the lens as a substitute for sunglasses. In our opinion this is misleading, and does not accurately describe this lens. Transitions and SunSensor lenses are made from lightweight plastic that changes from almost clear to approxamatly 70% absorbent grey or brown color. Transitions and SunSensors are brand names for this type of product.
You should know that:
- When the temperature rises, the ability of the lens to darken, and clear is reduced substantially. Conversely when the temperature drops to the 40 degree Fahrenheit range its ability to change increases.
- They will not darken in a car. Since the windows filter most of the Ultra-Violet rays of light.
Factory Eyeglass Outlet strongly recommends Corning’s SunSensor lenses. Unlike Transitions, Corning SunSensor lenses have the molecules that react to Ultra Violet light imbedded in the lens material not just on the surface like Transitions. This is the first photochromic material to optimize a wide variety of properties including darkening speed, attractive colors and longer life.
Molecules in all plastic photochromic lenses lose their darkening and lightening ability due to UV exposure over the course of time.