\ɹɪdjˈuːst ˈa͡ɪ], \ɹɪdjˈuːst ˈaɪ], \ɹ_ɪ_d_j_ˈuː_s_t ˈaɪ]\
Definitions of REDUCED EYE
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An imaginary e. in which the compound dioptric system of the human eye is reduced to a single refracting surface, bounded anteriorly by air and posteriorly by aqueous or vitreous humor. When great accuracy is not required, this reduced eye may be made the basis of a number of considerations and calculations.
By Smith Ely Jelliffe