Astigmatism

Astigmatism

An error of refraction in the eye so that rays of light in different meridians cannot be brought to a focus together on the retina.

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Part of Speech: noun
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Industry/Domain: Medical
Category: Diagnostic instruments & tests
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astigmatism

Medical; Illness

A condition of the eye in which the curve of the cornea or lens is uneven. In astigmatism, light coming into the eye is not focused properly on the retina.

astigmatism

Engineering; Electronic engineering

A focusing fault in a cathode-ray tube (CRT), in which electrons in different axial planes focus at different points.

astigmatism

Medical; Human genome

1) Unequal curvature of the refractive surfaces of the eye. Thus a point source of light cannot be brought to a point focus on the retina but is spread over a more or less ...

astigmatizer

Earth science; Mapping science

A lens which introduces astigmatism into an optical system. An astigmatizer is usually mounted so that it can be moved into or out of the optical path at will. In a sextant, ...

astigmatism

Health care; Optometry

Condition in which the cornea's curvature is asymmetrical (the eye is shaped like a football or egg instead of a baseball); light rays are focused at two points on the retina ...

astigmatism

Photography; Professional photography

lens aberration making a single point light source impossible to focus as a true point.

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