A | B | C | D | E | F | G | H | I | J | K | L | M | N | O | P | Q-R | S | T | U | V | W | X-Y | Z

Astigmatism

Synonym(s)

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 diffuse area. This results from the radius of curvature in one plane being longer or shorter than the radius at right angles to it. (Dorland, 27th ed): Definition from: Unified Medical Language System (MeSH) at the National Library of Medicine
optical defect in which refractive power is not uniform in all directions (meridians); light rays entering the eye are bent unequally by different meridians, which prevents formation of a sharp image focus on the retina.: Definition from: Unified Medical Language System (CRISP Thesaurus) at the National Library of Medicine


		About Site Map Contact Us
	A service of the U.S. National Library of Medicine®
Home Conditions Genes Chromosomes Handbook Glossary Resources