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)



Optical Index Pictures

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Lexicographical Neighbors of Optical Index

optical disc
optical discs
optical disk
optical double
optical drive
optical fiber
optical fibers
optical fibre
optical flat
optical flint
optical fusion
optical illusion
optical illusions
optical image
optical index (current term)
optical instrument
optical iridectomy
optical isomer
optical isomerism
optical isomers
optical keratoplasty
optical lens
optical maser
optical media
optical microscope
optical noise
optical opacity
optical pachymeter
optical phenomenon

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