Emmetropia


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Related to Emmetropia: ametropia

emmetropia

[‚em·ə′trō·pē·ə]
(medicine)
Normal vision.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.

Emmetropia

 

normal, or correct, refraction of the eye, as opposed to incorrect refraction, or ametropia, in which the optical system is unable to bring into focus on the retina the parallel light rays entering the eye.

The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.
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Nasal Temporal n p Myopia -0.33 [+ or -] 0.13 -0.30 [+ or -] 0.13 79 0.083 Emmetropia -0.35 [+ or -] 0.12 -0.20 [+ or -] 0.09 44 <0.001 p 0.287 <0.001 Note: n = number of eyes.
The RE was classified using the Spherical equivalent (SE), which is the sum of the value of the sphere and half of the cylindrical value.18 Emmetropia was attributed to SE between -0.50 D and +0.50 D, myopia to SE a$?
The rate of smoking was statistically significantly lower in the myopia group than in both the emmetropia and hypermetropia groups.
[12] Patients with SER [less than or equal to] [+ or -] 0.5 D were categorized as emmetropia, with SER [greater than or equal to] +0.5 D were categorized as hypermetropia, and patients with SER [greater than or equal to]-0.5 D were categorized as myopia.
The purpose of this study was to measure the intraocular distances (using A-scan ultrasound biometry) and corneal curvature (using keratometry) of feline eye and to use these data to predict appropriate posterior chamber IOL strength to achieve emmetropia after lens removal.
Dr Ioannis Aslanides, left, of the Emmetropia Mediterranean Eye Institute, and Anders Hedlund, founder of Tomorrow's Generation
The ACD was deeper in the myopic group (3.5 [+ or -] 0.4 mm) than in the emmetropia (3.4 [+ or -] 0.3 mm) and hyperopic (3.3 [+ or -] 0.2 mm) groups (both P < 0.0001); there was no significant difference in ACD between the emmetropic and hyperopic groups (P > 0.05).
The co-ordinated growth of the eye to reach emmetropia is dependent on clear visual input.
However, I hypothesize that the eye is incapable of such detection and will use a trial and error system to reach emmetropia. Experiments were performed to test this hypothesis.
Table 1 Clinical features and patient characteristics of those affected by PDS and PXS Pigment dispersion syndrome Pseudoexfoliation syndrome Iris transillumination defects Pupillary margin changes Krukenberg spindle Anterior lens material Brown band of pigment on Grey material on Schwalbe's line trabecular meshwork Patient in their 30s and 40s Patient in their 60s and 70s Men more than women Women more than men Myopia Emmetropia or hyperopia
However, Lee also analyzed ACD in different refractive groups (myopia, emmetropia and hyperopia) and found a deeper ACD in myopes.
Keywords: Emmetropia, Biometry, Keratometry, IOL specific constants.