optic axis
American Heritage Dictionary:
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optic axis
n.
An optical path through a crystal along which a ray of light can pass without undergoing double refraction.
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n.
The line connecting the anterior and the posterior poles of the eye.
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American Heritage Dictionary
The American Heritage® Dictionary of the English Language, Fourth Edition Copyright © 2007, 2000 by Houghton Mifflin Company. Updated in 2009. Published by Houghton Mifflin Company. All rights reserved.
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