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Definitions
(optics) defect in an optical system in which light rays from a single point fail to converge in a single focal point
Word origin
From a- (negative prefix) + Ancient Greek στίγμα (stígma, “mark, point”) + -ia.
Used in a sentence
“[…] and the measurement and correction of astigmia is one of the chief functions of the optometrist.”
“Astigmia of the whole eye […] is the resultant of the special astigmia of all four refracting surfaces, […]”
“Regular astigmia must be considered congenital, as a rule.”
Source: Wiktionary, CC BY-SA 4.0
Used as a crossword answer0 curated clues
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