Why haven’t SiH contact lenses conquered the world (yet)?
Morgan et al reported that in 2007 more than half of soft lens new fits in the United States and several eastern European countries were with silicone hydrogel lenses1. However the same article reported that these materials only accounted for 27% all new fits worldwide, a figure which many find disappointing given the many documented advantages associated with silicone hydrogel lenses. The number of currents wearers refitted with silicone hydrogel lenses are probably even lower.
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Complications of Contact Lens Wear
A slitlamp examination of a patient complaining of sore, red eyes and variable vision uncovered multiple contact lens related conditions. Although overwear of contact lenses is a contributing factor in this case, it is not a diagnosis in itself. A 35-year-old male presented on referral from a local optometrist. He reported sore, red eyes and variable vision for the previous two months and was wearing hydrogel contact lenses that had been prescribed in the United Kingdom about one year before. He was wearing the contact lenses all waking hours but denied sleeping in them.
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