Astigmatism Definition

ə-stĭgmə-tĭzəm
noun
An irregularity in the curvature of a lens, including the lens of the eye, so that light rays from an object do not meet in a single focal point, resulting in an indistinct or distorted image.
Webster's New World
Distorted view or judgment, as because of bias.
Webster's New World
A visual defect in which the unequal curvature of one or more refractive surfaces of the eye, usually the cornea, prevents light rays from focusing clearly at one point on the retina, resulting in blurred vision.
American Heritage Medicine

(optics) A defect of a lens such that light rays coming from a point do not meet at a focal point so that the image is blurred.

Wiktionary

(pathology) A disorder of the vision, usually due to a misshapen cornea, such that light does not focus correctly on the retina causing a blurred image.

Wiktionary
Synonyms:
Antonyms:

Other Word Forms of Astigmatism

Noun

Singular:
astigmatism
Plural:
astigmatisms

Origin of Astigmatism

  • a– Greek stigma stigmat- point (from stizein stig- to tattoo steig- in Indo-European roots)

    From American Heritage Dictionary of the English Language, 5th Edition

  • From a- (“not”) +‎ stem of Ancient Greek στίγμα (stigma, “mark, point”) +‎ -ism

    From Wiktionary

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