What is the MOST common type of oculomotor deviation?

The most common type of oculomotor deviation is exophoria. Exophoria refers to a tendency for the eyes to deviate outward when both eyes are open, but this deviation is usually not noticeable because the brain compensates for it by using fusion and other neurological mechanisms. It is prevalent in the general population, and often goes undetected as individuals may not experience symptoms or difficulties with their vision in everyday situations.

This condition can become more apparent during periods of fatigue or when engaging in tasks requiring intense visual concentration, such as reading or using a computer. Early detection of exophoria through vision screenings or examinations is important, as it may necessitate corrective measures if it leads to visual discomfort or impairment.

The other types of oculomotor deviations, such as hypophoria, hyperphoria, and esophoria, occur less frequently. They each represent specific forms of vertical and horizontal deviations but do not have the same prevalence in the general population as exophoria does.