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astigmatism
noun
Reveal meaning and examples
A refractive error in which the shape of the cornea or eye lens causes light to focus unevenly, potentially blurring or distorting vision.
The student learned how the word astigmatism differs from the word myopia.
A display entry on astigmatism described uneven focusing of light associated with the shape of an eye's cornea or lens, rather than using the term for any blurred photograph.