Esophoria
Esophoria
Esophoria (/ɛsəˈfɔːriə/; from Greek eso- meaning "inward" and -phoria from phoros meaning "bearing, carrying") is a type of heterophoria in which there is a tendency for the eyes to deviate inward. This condition is typically latent and only becomes apparent under certain conditions, such as fatigue or when the visual system is disrupted.
Definition
Esophoria is a condition characterized by the inward deviation of the eyes, typically when the individual is not focusing on an object or when the eyes are at rest. This condition is a subtype of heterophoria, which refers to any latent deviation of the eyes. Unlike esotropia, which is a constant inward turn of the eyes, esophoria is only apparent under certain conditions.
Symptoms
Common symptoms of esophoria include asthenopia (eye strain), headaches, difficulty reading, and occasionally, diplopia (double vision). These symptoms are often exacerbated by fatigue, illness, or prolonged periods of close work.
Causes
Esophoria can be caused by various factors, including uncorrected refractive error, convergence excess (a higher than normal convergence of the eyes when focusing on a near object), or neurological disorders. It can also be a normal variant in some individuals.
Treatment
Treatment for esophoria may include corrective eyeglasses, vision therapy, or in some cases, surgery. The goal of treatment is to alleviate symptoms and improve visual comfort and function.
Related Terms
- Heterophoria: A general term for latent deviation of the eyes, which includes esophoria, exophoria (outward deviation), and hyperphoria (vertical deviation).
- Esotropia: A constant inward turn of the eyes, which is a type of strabismus.
- Asthenopia: Eye strain, a common symptom of esophoria.
- Diplopia: Double vision, an occasional symptom of esophoria.
External links
- Medical encyclopedia article on Esophoria
- Wikipedia's article - Esophoria
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