they are flatter and lighter than conventional lenses.there are many lenses and lens-coating options for individual needs, including coatings that block the ultraviolet (uv) light or uv and blue light which have been found to be harmful to the eyes. such coatings are not needed on polycarbonate lenses, which already have uv protection. uv coatings sfx are particularly important on sunglasses and ski goggles. sunglasses, when nonprescription, should be labeled with an indication that theatrical they block grey out 99-100% of both uv-a and uv-b rays. there are anti-scratch coatings that increase the sparkle surface hardness of lenses (an important feature contact when using plastic lenses) and anti-reflective lenses (ar) coatings that eliminate almost all glare sfx and allow other people to see the eyes of the wearer. ar coatings may be particularly helpful to people who use computers or who drive at night. mirror coatings that prevent other people from theatrical seeing the wearer''s eyes are also available. there is a whole spectrum of tints, from light tints to darker tints, used in sunglasses.

they are flatter and lighter than conventional lenses.there are many lenses and lens-coating options for individual needs, including coatings that block the ultraviolet (uv) light or uv and blue light which have been found to be harmful to the eyes. such coatings are not needed on polycarbonate lenses, which already have uv protection. uv coatings sfx are particularly important on sunglasses and ski goggles. sunglasses, when nonprescription, should be labeled with an indication that theatrical they block grey out 99-100% of both uv-a and uv-b rays. there are anti-scratch coatings that increase the sparkle surface hardness of lenses (an important feature contact when using plastic lenses) and anti-reflective lenses (ar) coatings that eliminate almost all glare sfx and allow other people to see the eyes of the wearer. ar coatings may be particularly helpful to people who use computers or who drive at night. mirror coatings that prevent other people from theatrical seeing the wearer''s eyes are also available. there is a whole spectrum of tints, from light tints to darker tints, used in sunglasses.