In order to correct vision, contact lenses work in the same way as eyeglasses. To let the light focus nicely on to the retina, they bring about an alteration in the direction of light rays.
If one is near-sighted, the focus point is created right ahead of the retina instead of exactly on it. A contact lenses diverges light rays, and the focus point is then formed on the retina where it should be. So by wearing contact lenses, one is not required to strain the eyes to see.
In the same way, if one is farsighted, the eyes do not have sufficient focusing power. The light rays do not form a focal point by the time they reach the retina. By converging light rays, focusing power of eyes enhances. The focus point for eyes then moves forward, and is right on to the retina.
Contact lenses are thinner as compared to vision correction lenses. This is because vision correction lenses stay around 12 mm away from the eye while contact lenses rest directly on to the eyes. With its proximity to an eye, it may be possible to make the optic zone of a contact lens significantly smaller than the optic zone of a vision correction lens.
Optic zone of vision correction lenses is characteristically the entire surface of it and the lenses are around 46 mm in diameter. They are hence thicker and less vulnerable to breakage. But only the central part of a contact lens has correcting power. It is around 9mm in diameter and is surrounded by curves that fit the surface of the iris.
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