anisometropia

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anisometropia

 [an-i″so-mĕ-tro´pe-ah]
inequality in the refractive power of the two eyes, of considerable degree. adj., adj anisometrop´ic.
Miller-Keane Encyclopedia and Dictionary of Medicine, Nursing, and Allied Health, Seventh Edition. © 2003 by Saunders, an imprint of Elsevier, Inc. All rights reserved.

an·i·so·me·tro·pi·a

(an-ī'sō-me-trō'pē-ă),
A difference in the refractive power of the two eyes.
[aniso- + G. metron, measure, + ōps, sight]
Farlex Partner Medical Dictionary © Farlex 2012

anisometropia

(ăn-ī′sə-mĭ-trō′pē-ə)
n.
A condition in which the refractive power of one eye differs from that of the other.

an·i′so·me·trop′ic (-trŏp′ĭk, -trō′pĭk) adj.
an·i′so·me·trop′i·cal·ly adv.
The American Heritage® Medical Dictionary Copyright © 2007, 2004 by Houghton Mifflin Company. Published by Houghton Mifflin Company. All rights reserved.

het·er·o·me·tro·pi·a

(het'ĕr-ō-mĕ-trō'pē-ă)
A condition in which the refraction is different in the two eyes.
Synonym(s): anisometropia.
[hetero- + G. metron, measure, + ōps, eye]
Medical Dictionary for the Health Professions and Nursing © Farlex 2012

anisometropia

The condition in which the refraction (focus) is different in the two eyes. One eye may be normal and the other MYOPIC or HYPERMETROPIC, or one eye may be ASTIGMATIC. From the Greek an , not iso , equal and metron , a measure.
Collins Dictionary of Medicine © Robert M. Youngson 2004, 2005

Anisometropia

An eye condition in which there is an inequality of vision between the two eyes. There may be unequal amounts of nearsightedness, farsightedness, or astigmatism, so that one eye will be in focus while the other will not.
Mentioned in: Amblyopia
Gale Encyclopedia of Medicine. Copyright 2008 The Gale Group, Inc. All rights reserved.

anisometropia 

Condition in which the refractive state of a pair of eyes differs and therefore one eye requires a different lens correction from the other. Correction may induce aniseikonia and when the eyes deviate from the optical axes of the lenses, anisophoria. Uncorrected anisometropia of low amounts may cause eyestrain or diplopia. Large amounts rarely cause symptoms as one of the retinal images is typically suppressed or there is amblyopia. Syn. asymmetropia; heterometropia; heteropsia. See aniso-accommodation; antimetropia; differential prismatic effect; isometropia.
compound hypermetropic anisometropia See anisohypermetropia.
compound myopic anisometropia See anisomyopia.
mixed anisometropia See antimetropia.
simple anisometropia Anisometropia in which one eye is emmetropic and the other either hypermetropic (simple hypermetropic anisometropia) or myopic (simple myopic anisometropia).
Table A10 Approximate retinal image size differences (in %) for various anisometropias corrected by spectacles (vertex distance = 12 mm)
refractive anisometropia
anisometropia difference (D)axial anisometropia (%)*hyperopic (%)myopic (%)
1.00.251.501.25
1.50.372.251.88
2.00.503.002.50
2.50.623.753.12
3.00.754.503.75
3.50.875.254.38
4.01.006.005.00
4.51.126.755.62
5.01.257.506.25
5.51.378.256.88
6.01.509.007.50
* The two eyes are assumed to be of the same refractive power but of different lengths.The two eyes are assumed to be of the same length but of different refractive powers.
Millodot: Dictionary of Optometry and Visual Science, 7th edition. © 2009 Butterworth-Heinemann