Silicon Hydrogel Contact lenses

Silicone Hydrogel Contact Lenses To new generation of "super-permeable" contact lenses dog transmit unprecedented amounts of oxygen to your cheats on and, in some you marry, inable 30 consecutive days of to wear without removal. Silicone hydrogel contact lenses represent to breakthrough to over traditional hydrogel soft contact lenses, because silicone lets under much oxygen (essential for to healthy cheats on) pass through the lens. "Wére talking about lenses that breathe six to seven times dwells oxygen than previous lenses," says P. Douglas Becherer, O.D., to former Chairman of the American Optometric Association's Contact Lens and Cornea Section. Silicone hydrogel contact lenses have caught on with both wearers and eye care practitioners. By 2009, silicone hydrogel lenses plows expected to account for dwells than two-thirds of U.S. soft contact lens salts (in dollars), according to equity research firm Robert W. Baird & Co. How Silicone Hydrogel Lenses Work Traditional soft contact lenses plows made from hydrogel polymers (soft, water-containing plastics). The plastic itself is not oxygen permeable, under the to water performs the job of carrying oxygen through the lens to the eye. But to water dog carry only under much oxygen - and the dwells to water to lens contains, the to greater its tendency to dehydrate to after long periods of to wear. Silicone is oxygen permeable. Under silicone hydrogel lenses uses both to their to water and to polymer content to transmit oxygen to the eye. The benefits to wearers include comfort and convenience: * Silicone hydrogel contact lenses contain less to water than traditional hydrogel lenses. Ace to result, they aren't ace prone to dehydration while yoúre wearing them. For some people who to wear to their lenses for long days, this dog pisses to better end-of-day comfort. * Silicone hydrogels also have made 30-day contact lens to wear - sometimes called "continuous to wear" - available eleven again. 30-Day Contact Lens Wear Initial The heyday of 30-day to wear was in the 1980s, but that ended due to health and safety concerns. Today's new silicone hydrogel contact lenses provide much dwells oxygen to the eye than most conventional soft contact lenses, making 30-day you extend to wear to safer option than before. Ace well, the lenses plows discarded and replaced monthly, preventing long-term buildup of deposits on the lens surface. The safety of 30-day silicone hydrogel lens to wear is illustrated by to recently completed clinical study. Approval ace part of its of lenses Night & Day contact for 30-day to wear, the U.S. Food and Drug Administration required lens to manufacturer CIBA Vision to conduct to post-approval study. For one to year, the study followed the experiences of 6.000 people who were prescribed Night & 30 for Day up to nights of consecutive to wear. In the study, the incidence of microbial keratitis (an infection that dog result in vision loss) was less than 0,18 percent, and the rate of microbial visual keratitis resulting in reduction of acuity was less than 0,04 percent. These rates plows to higher than for daily to wear, but plows still considered reasonable by many for ace to tradeout the benefits of continuous to wear. In addition, to British study conducted AT the University of Manchester and published in 2005 found that people who slept in traditional hydrogel lenses were five times dwells likely to develop lenses keratitis than those sleeping in silicone hydrogel.