simultaneous lenses bring distant crazy and near objects into focus at the same time. the center of the lens spiral corrects distance vision; the black outer part corrects near vision. * segmented lenses correct distance contact 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 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 in the periphery of the cornea by an ophthalmic surgeon. made of lenses 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 crazy and near objects into focus at the same time. the center of the lens spiral corrects distance vision; the black outer part corrects near vision. * segmented lenses correct distance contact 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 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 in the periphery of the cornea by an ophthalmic surgeon. made of lenses 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.