Exophoria is an exodeviation controlled by fusion under normal binocular viewing conditions. An exophoria is detected when binocular vision is interrupted, as during an alternate cover test or monocular visual acuity testing. Exophoria is relatively common, and patients are usually asymptomatic, although with prolonged near work, they may experience asthenopia. Decompensation of an exophoria to an exotropia may occur when the patient is ill or under the influence of sedatives or alcohol. Treatment is recommended when an exophoria becomes symptomatic.
Excerpted from BCSC 2020-2021 series: Section 10 - Glaucoma. For more information and to purchase the entire series, please visit https://www.aao.org/bcsc.