At CR39 Transitions GEN S Lenses contain light-sensitive molecules that darken and lighten according to the intensity of ultraviolet light. Recent advances in Transitions GEN S technology ensure that they perform consistently across a wide range of temperatures and climates.

The greater the intensity of the UV rays, the darker the lens becomes. The moment the UV rays are no longer present, the lens begins to fade back to almost clear. Transitions GEN S Lenses do not change while driving in a car. All Transitions GEN S lenses come with 100% UV protection.

Prescription recommendation: (+3.00 to -6.00)