Hydrophilic lenses have introduced new and unique problems regarding contact lens hygiene (wetting, storage and cleaning). Special wetting agents are unnecessary with hydrophilic soft lenses, i.e., the H.E.M.A. lenses. However, the silicone lenses are hydrophobic, so they must be pretreated to increase wettability. Although there is general agreement that wet storage is the method of choice, sterility is a problem for which a variety of approaches have been developed. Cleaning soft lenses also presents unusual problems.
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