reduced eye
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re·duced eye
a simplified design of the ocular optic system, represented as having a single refracting surface and a uniform index of refraction; a model based on this concept is used in retinoscopy and ophthalmoscopy.
Farlex Partner Medical Dictionary © Farlex 2012
vergence
1. Denotes divergence of light travelling from, or convergence of light travelling from, or to an object or image. The
Millodot: Dictionary of Optometry and Visual Science, 7th edition. © 2009 Butterworth-Heinemann