Exophoria: Difference between revisions
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*Refractive errors - distance and near [[deviation]] approximately equal. | *Refractive errors - distance and near [[deviation]] approximately equal. | ||
* | *Divergence excess - exodeviation is more than 15 dioptres greater for distance than near deviation. | ||
*[[Convergence insufficiency]] - near exodeviation greater than distance deviation. | *[[Convergence insufficiency]] - near exodeviation greater than distance deviation. | ||
These can be due to [[nerve]], [[muscle]], or congenital problems, or due to mechanical | These can be due to [[nerve]], [[muscle]], or congenital problems, or due to mechanical anomalies. Unlike [[exotropia]], fusion is possible in this condition, causing [[diplopia]] to be uncommon. | ||
{{Eye pathology}} | {{Eye pathology}} | ||
[[Category:Eye]] | [[Category:Eye]] | ||
Latest revision as of 02:29, 9 August 2012
| Exophoria | |
| ICD-10 | H50.5 |
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| ICD-9 | 378.42 |
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Patient resources on Exophoria Discussion groups on Exophoria Directions to Hospitals Treating Exophoria Risk calculators and risk factors for Exophoria
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Overview
Exophoria is a form of heterophoria in which there is a tendency of the eyes to deviate outward.
Prevalence
Exophoria is particularly common in infancy and childhood, and increases with age.
Cause
Exophoria can be caused by several factors, which include:
- Refractive errors - distance and near deviation approximately equal.
- Divergence excess - exodeviation is more than 15 dioptres greater for distance than near deviation.
- Convergence insufficiency - near exodeviation greater than distance deviation.
These can be due to nerve, muscle, or congenital problems, or due to mechanical anomalies. Unlike exotropia, fusion is possible in this condition, causing diplopia to be uncommon.