emmetropia /em′ətrō″pē·ə/ [Gk, emmetros, proportioned, opsis, vision] , a state of normal vision characterized by the proper relationship between the refractive system of the eyeball and its axial length. This correlation ensures that light rays entering the eye parallel to the optic axis are focused exactly on the retina. Compare amblyopia, hyperopia, myopia. −emmetropic, adj.
