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  Toric lens
In optics, a toric lens is a type of lens whose surface is a combination of a sphere and a cylinder. One surface of the lens is spherical, the other toroidal. Such lenses are commonly used for vision correction, in cases where there is astigmatism.

   Toric Contact Lenses?


Toric contact lenses are made from the same materials as regular ("spherical") contact lenses, so they can be either soft or RGP. The difference is in the design of the lens. Toric lenses have two powers in them, created with curvatures at different angles, toric contact lenses cannot rotate on your eye.

A toric contact lens has two different powers or curvatures so that it can correct for both astigmatism and either myopia (near-sightedness) or hyperopia (far-sightedness). Increasingly, toric contact lenses, which typically combine the effects of a cylindrical lens with that of a spherical lens, are being prescribed for people who are astigmatic (i.e. have corneas that are not perfectly round) and also need help with their far-away or close-up vision. These are people who, in the past, may have been told that they are not suitable for contact lenses. Sometimes a patient will have astigmatism in only one eye. In such cases, the eye care practitioner may prescribe a toric lens for one eye and an ordinary spherical lens for the other.
 
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