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

optical crown
optical density
optical device
optical diffraction
optical disc
optical disk
optical fiber
optical fibre
optical flat
optical flint
optical fusion
optical glass
optical illusion
optical illusions
optical image
optical index (current term)
optical instrument
optical iridectomy
optical isomerism
optical isomers
optical keratoplasty
optical lens
optical maser
optical microscope
optical noise
optical opacity
optical pachymeter
optical phenomenon
optical prism
optical pyrometer

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