These lenses are designed to automatically adjust to the amount of ultraviolet light (UV) that reaches the lens. The transmission rate is the amount of visible light penetrating the lens and reaching the eyes. The higher the transmission rate the lighter the lens color. Clear lenses have a transmission rate between 80-100% and typical smoke lenses have a transmission rate between 8-18%. The advantage of Photochromic lenses is that you can wear your eyewear from morning into evening and not have to have multiple sets of eyewear with you or have to change your lenses throughout the day.
- Photochromic lenses do NOT get as dark as traditional smoke grey lenses
- Photochromic lenses require UV rays to change, so will not work when used in the car or behind face shields
- Allow up to 7 cycles of lenses changing from clear to smoke for full effectiveness