Definition of Astigmetism
A*stig"ma*tism (&?;), n. [Gr. 'a
priv. + &?;, &?;, a prick of a pointed instrument, a spot, fr. &?; to
prick: cf. F. astigmatisme.] (Med. & Opt.) A defect of
the eye or of a lens, in consequence of which the rays derived from one
point are not brought to a single focal point, thus causing imperfect
images or indistinctness of vision.
&fist; The term is applied especially to the defect causing images of
lines having a certain direction to be indistinct, or imperfectly seen,
while those of lines transverse to the former are distinct, or clearly
seen.
- Webster's Unabridged Dictionary (1913)
- (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.
- (pathology) A disorder of the vision, usually due to a misshaphen cornea, such that light does not focus correctly on the retina causing a blurred image.
- The Nuttall Encyclopedia
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