Exophoria
| Exophoria | |
|---|---|
| Specialty | Ophthalmology |
Exophoria is a form of heterophoria in which there is a tendency of the eyes to deviate outward.[1] During examination, when the eyes are dissociated, the visual axes will appear to diverge away from one another.[2]
The axis deviation in exophoria is usually mild compared with that of exotropia.
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 dioptresgreater 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.
Diagnosis
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Prevalence
Exophoria is particularly common in
childhood, and increases with age.[3][clarification needed
]
References
- ^ Allen, Edmund Turney (1899). The science of higher prisms. Harvard University: G. K. Hazlitt 6 Co., printer. p. 39.
- ISBN 978-0-7506-7575-8.)
{{cite book}}: CS1 maint: location missing publisher (link - S2CID 11180397.