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About: Reduced eye     Goto   Sponge   NotDistinct   Permalink

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The reduced eye is an idealized model of the optics of the human eye. Introduced by Franciscus Donders, the reduced eye model replaces the several refracting bodies of the eye (the cornea, lens, aqueous humor, and vitreous humor) by an ideal air/water interface surface that is located 20 mm from a model retina. This, converts a system with six cardinal points (two focal points, two principal points and two nodal points) into one with three cardinal points (two focal points and one nodal point).