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lenses for nearsighted people are thin in the center but get thicker at the edge of that center zone. to correct farsightedness, lenses have a thick center that tapers down at the edge of the optical zone. because standard lenses are free to rotate as they sit on the eye''s surface, they can''t correct for astigmatism, a condition in which the cornea doesn''t have a spherical shape. astigmatic eyes require toric lenses, which have different lens powers along different axes of vision. recently, lens designers have produced lenses contacts for astigmatism. by making the outer part of the lens, called the carrier portion, thicker on one side cheap than the other, the manufacturer can ensure that the correction stays in line with the axis of irregular vision. as the wearer blinks and the lens moves, the thicker, heavier part stays at the bottom, ensuring that contact the lens is oriented correctly. these contacts have become widely available within the past 2 years.

lenses for nearsighted people are thin in the center but get thicker at the edge of that center zone. to correct farsightedness, lenses have a thick center that tapers down at the edge of the optical zone. because standard lenses are free to rotate as they sit on the eye''s surface, they can''t correct for astigmatism, a condition in which the cornea doesn''t have a spherical shape. astigmatic eyes require toric lenses, which have different lens powers along different axes of vision. recently, lens designers have produced lenses contacts for astigmatism. by making the outer part of the lens, called the carrier portion, thicker on one side cheap than the other, the manufacturer can ensure that the correction stays in line with the axis of irregular vision. as the wearer blinks and the lens moves, the thicker, heavier part stays at the bottom, ensuring that contact the lens is oriented correctly. these contacts have become widely available within the past 2 years.

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