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