PRINCIPAL FOCUS OF THE EYE
\pɹˈɪnsɪpə͡l fˈə͡ʊkəs ɒvðɪ ˈa͡ɪ], \pɹˈɪnsɪpəl fˈəʊkəs ɒvðɪ ˈaɪ], \p_ɹ_ˈɪ_n_s_ɪ_p_əl f_ˈəʊ_k_ə_s ɒ_v_ð_ɪ_ ˈaɪ]\
Sort: Oldest first
-
That point posterior to the refractive media of the eye at which rays impinging upon the cornea in a direction parallel to the optic axis are united. In emmetropic eyes the principal f. is upon the retina; in myopic eyes, in front of it; in hypermetropic eyes, behind it.
By Smith Ely Jelliffe
