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