The term is from Greek eso meaning "inward" and trope meaning "a turning".
Someone with esotropia will squint with either the right or the left eye but never with both eyes simultaneously.
When we accommodate on a close target, this powerful focusing force also activates convergence, or turning inward of the eyes to look at or be aligned upon nearby objects.
One situation in which esotropia management gets tricky is when the child also has myopia (short-sightedness / near sightedness).
These combinations don’t happen all that often in the world of esotropia, but when they do treatment isn’t quite as simple.
Amblyopia can, however, arise as a result of esotropia occurring in childhood: In order to relieve symptoms of diplopia or double vision, the child's brain will ignore or “suppress” the image from the esotropic eye, which when allowed to continue untreated will lead to the development of amblyopia.
Treatment options for esotropia include glasses to correct refractive errors (see accommodative esotropia below), the use of prisms and/or orthoptic exercises and/or eye muscle surgery.