biomedic

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Typical teen curiosity has some eye doctors concerned about infections that could spread from one youngster to another when they trade cosmetic Lenses. The lenses often worn to change eye color or add designs, 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. Fortunately, cases have been rare, but some have been serious. Kids are unaware that these are optical devices, and they''re using them as toys. Soft Lenses are like sponges, and they can hold onto bacteria. Doctors also warn that an ill-fitted lens can cause damage to the eye''s surface. 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.

An added benefit is that soft lenses aren''t as likely as rigid lenses to pop out or capture foreign material like dust underneath. Extra-thin soft lenses biomedic are available for very sensitive people. While the ability to hold water increases oxygen permeability of soft lenses, it increases their fragility as well. Rigid lenses generally give clearer vision. They can be marked to show which lens is for which eye. They don''t rip or tear, so they''re easy to handle. Also, rigid lenses don''t absorb chemicals, unlike soft lenses, which are like sponges. They''ll suck up any residues on your hands--soap, lotion, whatever. Both soft and rigid lenses offer bifocal correction. In some models, each lens corrects for near and distance vision. In others, one lens is for near vision, and the other is for distance. Middle-aged people who have good distance vision but need help for reading can get a monovision reading lens for one eye.

Soft extended-wear lenses also bind down on the closed eye, but they are porous and allow some tears through during sleep. Because they have so little form, their binding has little effect on the shape of the eye. has approved extended-wear lenses for use up to seven days before removal for cleaning. Still, there are risks with use of extended-wear lenses, even if it''s just one night. Daily-wear lenses are removed daily for cleaning and are a safer choice, provided they aren''t worn during sleep. Another sight-threatening concern is the infection Acanthamoeba keratitis, caused by improper lens care. This difficult-to-treat parasitic infection''s symptoms are similar to those of corneal ulcers. Soft lenses are much more comfortable than rigid lenses, thanks to their ability to conform to the eye and absorb and hold water. You can get used to soft lenses within days, compared with several weeks for rigid.

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