they can be worn up to a week. daily wear lenses are made of plastic that is permeable to oxygen and absorbs water; therefore, they are soft and flexible. these lenses must be removed and cleaned each night, and they do not correct all vision problems. lenses are easier to get used blue to than rigid lenses, but are more prone to tears and do not last as long. extended-wear lenses are highly permeable to oxygen, are flexible by virtue of their ability to sfx absorb water, and can usually be worn for up to one week. they do not correct all vision problems. there is more of a risk of infection with extended-wear lenses than with daily-wear lenses. extended-wear disposable theatrical lenses are lenses worn continually for up to six days and then discarded, with no need for cleaning.

they can be worn up to a week. daily wear lenses are made of plastic that is permeable to oxygen and absorbs water; therefore, they are soft and flexible. these lenses must be removed and cleaned each night, and they do not correct all vision problems. lenses are easier to get used blue to than rigid lenses, but are more prone to tears and do not last as long. extended-wear lenses are highly permeable to oxygen, are flexible by virtue of their ability to sfx absorb water, and can usually be worn for up to one week. they do not correct all vision problems. there is more of a risk of infection with extended-wear lenses than with daily-wear lenses. extended-wear disposable theatrical lenses are lenses worn continually for up to six days and then discarded, with no need for cleaning.

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 electric lenses frames; they do not fog-up or get splattered, so it is possible to see well while blue walking in the rain; and they are less noticeable than any lenses style. on the other hand, they take time to get accustomed to; require more measurements for fitting; require many follow-up visits to the eye doctor; can lead to complications such as infections and corneal damage; and may not correct astigmatism as well as lenseses, sfx especially if the astigmatism is severe.