Definition from Wiktionary, the free dictionary
astigmatism (plural astigmatisms)
- (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.
- (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.
defect of a lens
disorder of the vision
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