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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 (-trŏp′ĭk, -trō′pĭk) 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.


(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 adj
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014


(ˌɛm ɪˈtroʊ pi ə)

the normal refractive condition of the eye in which the rays of light are accurately focused on the retina.
[1860–65; < Greek émmetr(os) in measure, fitting]
em′me•trope`, n.
em`me•trop′ic (-ˈtrɒp ɪk, -ˈtroʊ pɪk) adj.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.

emmetropia, emmetropy

the normal refractive function of the eye in which light is focused exactly on the retina with the eye relaxed. — emmetropic, adj.
See also: Eyes
-Ologies & -Isms. Copyright 2008 The Gale Group, Inc. All rights reserved.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.emmetropia - (ophthalmology) the normal refractive condition of the eye in which there is clear focus of light on the retina
ophthalmology - the branch of medicine concerned with the eye and its diseases
physical condition, physiological condition, physiological state - the condition or state of the body or bodily functions
Based on WordNet 3.0, Farlex clipart collection. © 2003-2012 Princeton University, Farlex Inc.
References in periodicals archive ?
In the present study, the temporal Q values of the emmetropia group of adults and all children's groups were significantly different from the nasal Q values.
For patients who have enjoyed relatively good vision with near emmetropia all of their life, experiencing the vision change of presbyopia comes as a surprise.
KEYWORDS: Ametropia, Astigmatism, Emmetropia, Hyperopia, Myopia, Refractive error, Visual impairment.
[4] In the past, cataract surgery meant only to remove the opaque lens and implant an IOL and attain emmetropia. But now the expectation of the patient is not only emmetropia but spectacle independence for distance, intermediate and near.
Broadly speaking, the dominant eye is targeted for emmetropia with the non-dominant eye being targeted for varying levels of myopia depending on the accommodative capacity and needs of the individual patient.
Values between +0.50 D and -0.50 D were defined as emmetropia, values below -0.50 D as myopia, and values above +0.50 D as hypermetropia.
THURSDAY, May 10, 2018 (HealthDay News) -- Extended range of vision (ERV) intraocular lens (IOL) targeted to achieve micro-monovision shows superior range of visual acuity and independence from glasses compared to the monofocal IOL targeted to achieve emmetropia, according to a study published online May 3 in Clinical & Experimental Ophthalmology.
If a patient had a pre-operative refraction, measured in the standard manner (i.e., in the plane of the spectacles, approximately 12 mm from the corneal apex) of -5.25 Diopters (D), and after refractive surgery is found in emmetropia (that is, with an error of zero D), the method is applied in the following manner:
Aiming for emmetropia after cataract surgery: Swedish National Cataract Register study.
On the other hand, we must take into account other terms, such as emmetropia and clinical emmetropia, since they are the other variables in which people are classified when generating an assessment of visual capacity.
Functional emmetropia was defined as uncorrected visual acuity better than 20/20 in both eyes and uncyclopleged spherical equivalent refraction between +1 and -1 diopters.
Eye growth after 18 months of life, in juvenile age, enters a slow phase of 0.01 mm in diameter per month and myopic shift occurs; therefore, targeted IOL power should be undercorrecting (hyperopic) in order to ensure emmetropia or low myopia in adult age [41, 48-50].