Medical Definition of Optical index
1.
A constant applied to objectives for purposes of comparison. It takes into account the focal length or magnifying power of the lens and also the numerical aperture. It was offered by Nelson and by Coles, but little use has been made of the optical index figure, probably because the equations of the two men differed and the resulting figures have been at variance.
(05 Aug 1998)
Lexicographical Neighbors of Optical Index
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