farsightedness or hyperopia, condition in which far objects can be seen easily but there is difficulty in near vision. It is caused by a defect of refraction in which the image is focused behind the retina of the eye rather than upon it, either because the eyeball is too short or because the refractive power of the lens is too weak. Presbyopia, a similarly faulty vision, is attributable to physiological changes in the lens brought on by age. Corrective eyeglasses with convex lenses compensate for the refractive errors.

The Columbia Electronic Encyclopedia, 6th ed. Copyright © 2012, Columbia University Press. All rights reserved.

More on farsightedness from Fact Monster:

  • hyperopia - hyperopia hyperopia : see farsightedness.
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  • astigmatism - astigmatism astigmatism , type of faulty vision caused by a nonuniform curvature in the refractive ...
  • eyeglasses - eyeglasses eyeglasses or spectacles,instrument or device for aiding and correcting defective sight. ...
  • eye: The Human Eye - The Human Eye Anatomy and Function The human eye is a spheroid structure that rests in a bony ...

See more Encyclopedia articles on: Pathology

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