astigmatism [uh-stig-muh-tiz-uh m] ExamplesWord Origin noun
- Also called a·stig·mi·a [uh-stig-mee-uh] /əˈstɪg mi ə/. Ophthalmology. a refractive error of the eye in which parallel rays of light from an external source do not converge on a single focal point on the retina.
- Optics. an aberration of a lens or other optical system in which the image of a point is spread out along the axis of the system.
If you don’t just see things as they see them, you’re troubled with astigmatism.
Robert W. Service
You must see some good oculist about your astigmatism, my dear.
H. L. Mencken
To her it was as though her own eyesight were normal, and astigmatism the rule among other people.
Robert W. Chambers
To such let me explain that I am suffering from astigmatism.
A diagram similar to Fig. 394 is used as a test for astigmatism.
Willis Eugene Tower
British Dictionary definitions for astigmatism astigmatism astigmia (əˈstɪɡmɪə) noun
- a defect of a lens resulting in the formation of distorted images; caused by the curvature of the lens being different in different planes
- faulty vision resulting from defective curvature of the cornea or lens of the eye
Word Origin and History for astigmatism n.
astigmatism in Medicine astigmatism [ə-stĭg′mə-tĭz′əm] n.
- 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.astigmia
Related formsas′tig•mat′ic (ăs′tĭg-măt′ĭk) adj. n. astigmatism in Science astigmatism [ə-stĭg′mə-tĭz′əm]
- 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 a single point on the retina, resulting in blurred vision.
astigmatism in Culture astigmatism [(uh-stig-muh-tiz-uhm)]