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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.

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.

another phenomenon associated primarily with hard lenses is "spectacle blur." when a hard lens is placed on the cornea, the surface topography of the eye is altered, so the patient may have visual disturbances with glasses immediately after removing the lens. spectacle blur, in general, is cleared in about 30 minutes, but use of more oxygen-permeable lenses minimizes the problem. lenses advantages of hard lenses include favorable specific gravity (1.18-1.20) and refractive index (1.49-1.50), excellent visual acuity, durability, ability to withstand weak alkalis or weak acids, and no sensitivity reactions when placed on the cornea. hard lenses are also relatively resistant to the absorption of disinfectants, prices surfactant cleaners and environment lenses pollutants; they are easy to handle during insertion and removal. disadvantages prices of hard lenses include a longer adaptation time, poor oxygen permeation and ocular discomfort.

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