astigmatic dial
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as·tig·mat·ic di·al
a diagram of radiating lines, used to test for astigmatism.
Farlex Partner Medical Dictionary © Farlex 2012
astigmatic dial
A circular dial with black lines of uniform width drawn as if they were connecting opposing numbers on the face of a clock. It is used in testing for astigmatism.
See also: dial
Medical Dictionary, © 2009 Farlex and Partners