Associations to the word «Astigmatism»

Wiktionary

ASTIGMATISM, noun. (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.
ASTIGMATISM, noun. (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.

Dictionary definition

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

Wise words

Abuse of words has been the great instrument of sophistry and chicanery, of party, faction, and division of society.
John Adams