Heterophoria is an underlying ocular muscle imbalance in which the eyes tend to deviate from their normal alignment, but this is usually compensated for by visual mechanisms so is not outwardly visible. Symptoms can include eye fatigue, headaches, blurred vision and difficulty concentrating on close objects. There are different types of heterophoria, depending on the direction of eye deviation: esophoria (inwards), exophoria (outwards), hyperophoria (upwards) and hypoophoria (downwards). Treatment of heterophoria may include orthoptic exercises, prismatic correction with glasses and, in some cases, vision therapy.
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