emmetropiaem·me·tro·pi·a (?m??-tr??p?-?)n. The condition of the normal eye when parallel rays of light are focused exactly on the retina and vision is perfect.[Greek emmetros, well-proportioned, fitting (en, in; see en-2 + metron, measure; see meter2) + -opia.]em?me·trop?ic (-tr?p??k, -tr??p?k) adj.American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.emmetropia (??m??tr??p??) n (Physiology) the normal condition of perfect vision, in which parallel light rays are focused on the retina without the need for accommodation[C19: from New Latin, from Greek emmetros in due measure + -opia] emmetropic adjCollins English Dictionary ? Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014em?me?tro?pi?a (??m ??tro? pi ?) n. the normal refractive condition of the eye in which the rays of light are accurately focused on the retina. [1860?65;