SETO 1.56 Semi-Finished Photochromic Lens

The knowledge of Photochromic lens

1. The definition of photochromic lens
①Photochromic lenses, often called transitions or reactolights, darken to a sunglasses tint when exposed to sunlight, or U/V ultraviolet, and return to a clear state when indoors, away from U/V light.
②Photochromic lenses are made of many lens materials including plastic, glass or polycarbonate. They are typically used as sunglasses that conveniently switch from a clear lens indoors, to a sunglasses depth tint when outdoors, and vice versa.
③Brown / Photo Grey Photochromic Lens For Outdoor Activities 1.56 Hard Multi Coated
2. Outstanding Color Performance
① Fast speed of changing, from white to dark and vice versa.
②Perfectly clear indoors and at night, adapting spontaneously to varying light conditions.
③Very deep color after change, the deepest color can be up to 75~85%.
④Excellent color consistency before and after change.
3. UV Protection
Perfect blockage of harmful solar rays and 100% UVA & UVB.
4. Durability of Color Change
①Photochromic molecules are equally bedded in lens material, and are activated year by year, which ensure durable and consistent color change.
②You might think all of this would take quite a bit of time, but photochromic lenses respond remarkably quickly. About half the darkening happens within the first minute and they're cutting out about 80% of sunlight within 15 minutes.
③Imagine lots of molecules suddenly darkening inside a clear lens. It's a bit like closing the blinds in front of your window on a sunny day: as the slats turn, they progressively block out more and more light.