Strabismus is a misalignment of the eyes such that both eyes are not directed simultaneously at the same object. Esotropia is a type of strabismus characterized by an inward deviation of one eye relative to the other eye. The accommodative convergence/accommodation (AC/A) ratio gives the relationship between the amount of convergence (in-turning of the eyes) that is generated by a given amount of accommodation (focusing effort). Esotropia with high AC/A ratio (also termed nonrefractive accommodative esotropia) combines a high AC/A ratio with low hyperopia or even myopia. Amblyopia (reduced visual acuity due to an abnormal visual experience early in life) frequently develops if the condition remains untreated. 
No racial predilection exists for esotropia with high AC/A ratio.
No sex predilection exists for esotropia with high AC/A ratio.
Esotropia with high AC/A ratio presents by the age of 2 years.