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astigmatism

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astigmatism

Aberration occurring in the lens of the eye. It results when the curvature of the lens differs in two perpendicular planes, so that rays in one plane may be in focus while rays in the other are not. With astigmatic eyesight, the vertical and horizontal cannot be in focus at the same time; correction is by the use of a lens that reduces the overall focal length of one plane so that both planes are seen in sharp focus.



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? Mentioned in ? References in periodicals archive
 
Key statement: Correction of eye refractive errors like presbyopia, hyperopia, myopia and astigmatism using either pre-tensioned or transcutaneously energized artificial muscle implants.
Surgical correction of human eye refractive errors by active ... by Samples, Bob / Rubber World
With some tweaking, could nearsightedness and astigmatism be treated as well?
Looking into the future by Weiss, P. / Science News
A Astigmatism is a vision condition that occurs when surfaces of the eye, such as the cornea, are oval-shaped like an egg.
Commonly asked questions about vision by National Women's Health Report
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