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extended lenses in particular pose a much greater risk than daily wear lenses. Though extended-wear 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 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 recommend acuvue removing extended lenses at night. In price addition, newer order versions acuvue of extended lenses being developed price may offer increased order oxygen exchange and pose less acuvue risk. Disposable lenses may also help to prevent infection, since the wearer is guaranteed price a clean pair of lenses every few weeks or every day.

lensesesOver 140 million people in the order United States wear lenseses. People whose eyes have refractive errors acuvue do price not see clearly without glasses, because the light emitted from the objects order they are observing acuvue does not come into focus on their retinas. For people who are farsighted, images come into focus behind the price retina; for people order who are nearsighted, images come into focus in front of the retina. Lenses work by changing the direction of light so that images come into focus on the retina. The greater the index of refraction of the lens acuvue material and the greater the difference in the curvature between the two surfaces of the lens, the greater price the change in direction of light order that passes through it, and the acuvue greater the correction.Lenses can be unifocal, with one correction for all distances, or they can be correct for more than one distance (multifocal). price One type of multifocal, the bifocal, has an area of the lens (usually order at the bottom) that corrects for nearby objects (about 14 in from the eyes); the remainder of the lens corrects for distant objects (about 20 ft from the eyes).