ASTIGMATISM

n. a visual disorder that occurs when the light rays of a visual stimulus do not all focus on a single point on the retina. Astigmatism is generally caused by uneven curvature of the cornea. As a result, light rays are refracted differentially, depending on the angle of the curve. The effect is an aberration or distortion of the visual image - not unlike the reflection seen in a deliberately distorted funhouse mirror. Astigmatism causes meridional amblyopia and can occur in the presence of myopia or hyperopia.

ASTIGMATISM: "The person with an astigmatism suffered distorted vision because his or her cornea was curved in an unusual way. "
Cite this page: N., Pam M.S., "ASTIGMATISM," in PsychologyDictionary.org, April 7, 2013, https://psychologydictionary.org/astigmatism/ (accessed August 20, 2019).
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