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typical teen curiosity has some eye doctors concerned about infections that could spread from one youngster to buy another when they trade cosmetic contact lenses. the lenses often worn to change lenses eye color or add designs, online but not necessarily to correct vision. and with this halloween sparking the highest-ever interest in novelty lenses -- the kind imprinted with images -- consumer groups are warning users about the dangers of lens swapping. buy fortunately, cases have been rare, but some have been serious. kids are unaware that these are optical devices, and they''re using them contact as toys. soft lenses are like sponges, and they can hold onto bacteria. doctors also warn that an ill-fitted lens can lenses cause damage to the eye''s surface. online even if a lens does not correct vision, it is considered a medical device and can be sold only by prescription. wearers must have eye exams; lenses must be fitted properly.

typical teen curiosity has some eye doctors concerned about infections that could spread from one youngster to buy another when they trade cosmetic contact lenses. the lenses often worn to change lenses eye color or add designs, online but not necessarily to correct vision. and with this halloween sparking the highest-ever interest in novelty lenses -- the kind imprinted with images -- consumer groups are warning users about the dangers of lens swapping. buy fortunately, cases have been rare, but some have been serious. kids are unaware that these are optical devices, and they''re using them contact as toys. soft lenses are like sponges, and they can hold onto bacteria. doctors also warn that an ill-fitted lens can lenses cause damage to the eye''s surface. online even if a lens does not correct vision, it is considered a medical device and can be sold only by prescription. wearers must have eye exams; lenses must be fitted properly.

the water carries dissolved oxygen buy through these lenses to the eye surface, says an optometrist and head of clinical affairs at ciba vision. "the eye needs oxygen to keep the tissue healthy." contact a high water content also makes soft lenses more comfortable. people blink about every 5 seconds, and a wet lens surface reduces the friction between the eyelid and the plastic. for 20 years, most of the innovations in soft lenses boosted the hydrogel''s water content. this approach has its limits, though. too much water makes the lens fragile and difficult to handle. contact lenses lens wearers become frustrated trying to slide a floppy lens from a fingertip to an eye. moreover, even if a lens could be made of a layer of pure water, it wouldn''t get enough online oxygen to the eye. researchers decided to find new polymers that could allow greater oxygen flow.

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