simultaneous lenses bring distant and near objects into focus at the same time. the center of the lens corrects distance vision; the outer part corrects near vision. * segmented lenses correct distance sfx vision in the top half and near vision in the bottom half.monovision an alternative to bifocal contacts, monovision lenses correct distance vision in one eye theatrical and near vision in the other. modified monovision allows wearers to put a bifocal lens in one eye and a single-vision lens in the other.implants designed for mild nearsightedness, keravision intacs are placed mirror in the periphery of the cornea by an ophthalmic surgeon. made of polymer, a type of hard plastic, they require no maintenance and can be surgically removed. the outpatient procedure has a 97-percent success rate of 20/40 vision or better.

simultaneous lenses bring distant and near objects into focus at the same time. the center of the lens corrects distance vision; the outer part corrects near vision. * segmented lenses correct distance sfx vision in the top half and near vision in the bottom half.monovision an alternative to bifocal contacts, monovision lenses correct distance vision in one eye theatrical and near vision in the other. modified monovision allows wearers to put a bifocal lens in one eye and a single-vision lens in the other.implants designed for mild nearsightedness, keravision intacs are placed mirror in the periphery of the cornea by an ophthalmic surgeon. made of polymer, a type of hard plastic, they require no maintenance and can be surgically removed. the outpatient procedure has a 97-percent success rate of 20/40 vision or better.

they contact are flatter and lighter than conventional lenses.there are lens many lenses and lens-coating options for individual needs, including coatings that block the ultraviolet sfx (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 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 that eliminate almost all glare and allow other people theatrical to see the eyes of the wearer. ar coatings mirror may be particularly helpful to people who use computers or who drive at night. mirror coatings that prevent contact other people from seeing the wearer''s eyes are also available. there is a whole spectrum of tints, from light tints to darker lens tints, used in sunglasses.