astigmatism


astig·ma·tism

noun \ə-ˈstig-mə-ˌti-zəm\

medical : a problem with the eye that prevents a person from seeing clearly

Full Definition of ASTIGMATISM

1
:  a defect of an optical system (as a lens) causing rays from a point to fail to meet in a focal point resulting in a blurred and imperfect image
2
:  a defect of vision due to astigmatism of the refractive system of the eye and especially to corneal irregularity
3
:  distorted understanding suggestive of the blurred vision of an astigmatic person

First Known Use of ASTIGMATISM

1846

Rhymes with ASTIGMATISM

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astig·ma·tism

noun \ə-ˈstig-mə-ˌtiz-əm\   (Medical Dictionary)

Medical Definition of ASTIGMATISM

1
: a defect of an optical system (as a lens) causing rays from a point to fail to meet in a focal point resulting in a blurred and imperfect image
2
: a defect of vision due to astigmatism of the refractive system of the eye and especially to corneal irregularity—compare emmetropia, myopia

astigmatism

noun    (Concise Encyclopedia)

Lack of symmetry in the curvature of the cornea or, rarely, the lens of the eye. The unequal curvatures spread light rays, preventing them from being sharply focused at a point on the retina, causing blurring of part of the image. The effect of astigmatism can also be produced by misalignment of the lens. Astigmatic vision is corrected by means of lenses (see contact lens, eyeglasses) that refract the light rays to the proper degree in the opposite direction of that produced by the defects in curvature.

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