astigmia

noun

1. (dated, uncountable, usually)astigmatism

   “[…] 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.”

   “When the corneal astigmia is direct, and about 0.75 D., we may expect to find an almost total absence of astigmia by subjective examination.”