astigmatism

Estimated CEFR level: C2 — Proficiency

Estimated from word frequency; not an official CEFR classification.

Definition

noun (ophthalmology) impaired eyesight resulting usually from irregular conformation of the cornea; common in nearsighted people
noun (optics) defect in an optical system in which light rays from a single point fail to converge in a single focal point

From a- (negative prefix) + stem of Ancient Greek στίγμα (stígma, “mark, point”) + -ism. Coined by English polymath William Whewell in 1846.

To such let me explain that I am suffering from astigmatism. — Humorous Ghost Stories, Dorothy Scarborough

astigmia

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