over 32 million people in the united states wear these small lenses that fit on top of the cornea. they provide a field of view unobstructed by lenses frames; they do not fog-up or get splattered, so it is possible to see well while walking in the rain; and they are less noticeable than any theatrical lenses style. on the other hand, they take time to get accustomed to; require more measurements smiley for fitting; require many follow-up contact visits to the eye doctor; can lead to complications such as infections and corneal damage; and may not correct astigmatism as well as lenseses, especially if the astigmatism is severe.

over 32 million people in the united states wear these small lenses that fit on top of the cornea. they provide a field of view unobstructed by lenses frames; they do not fog-up or get splattered, so it is possible to see well while walking in the rain; and they are less noticeable than any theatrical lenses style. on the other hand, they take time to get accustomed to; require more measurements smiley for fitting; require many follow-up contact visits to the eye doctor; can lead to complications such as infections and corneal damage; and may not correct astigmatism as well as lenseses, especially if the astigmatism is severe.

extended lenses in particular pose lens and sfx a much greater risk than daily wear lenses. though extended-wear theatrical lenses are extremely thin and allow some oxygen--necessary for healthy eyes--to reach the cornea, they are worn continuously, including at night while the eyelid is closed. bacteria smiley can easily grow more easily under these conditions. twenty-one in 1,000 extended lens wearers develop infections as opposed to 4 in 1,000 daily soft lens wearers. to reduce this risk, eye care professionals now contact recommend removing extended lenses at night. in addition, newer versions of extended lenses being developed may offer increased oxygen exchange and pose less risk. disposable lenses may also help to prevent infection, since the wearer is guaranteed a clean pair of lenses every few weeks or every day.