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Simultaneous lenses bring distant and near objects cibavisionfocuscontactlenses into focus at the same time. The center of the lens corrects distance vision; the outer part corrects near vision. * Segmented lenses correct distance vision in the top cibavisionfocuscontactlenses half and near vision in the cibavisionfocuscontactlenses bottom half.Monovision cibavisionfocuscontactlenses An alternative to bifocal contacts, monovision lenses correct distance vision in cibavisionfocuscontactlenses one eye and near vision in the other. Modified monovision allows wearers to put a bifocal lens in cibavisionfocuscontactlenses one eye and a single-vision lens in the other.Implants Designed for mild cibavisionfocuscontactlenses nearsightedness, KeraVision Intacs are placed 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.

Originally, hard contact were cibavisionfocuscontactlenses made cibavisionfocuscontactlenses of a material called PMMA. Although still available, the more common types of contact are listed below:Rigid gas-permeable (RGP) daily-wear lenses are made of plastic that does not absorb water but cibavisionfocuscontactlenses allows oxygen to get from the atmosphere to the cornea. (This is important because the cornea has no blood supply and needs to get its oxygen from the atmosphere through the film of tears that moves beneath the lens.) They must be removed and cleaned each night. Rigid gas-permeable (RGP) extended-wear lenses are made from plastic that also does not absorb water but is more permeable to oxygen than the plastic used for daily-wear lenses.