A squint or strabismus refers to a misalignment of the eyes There are many different types of squint.
An esotropia where one eye turns in towards the nose.
An exotropia where the one eye turns outwards.
where one eye is higher (hypertropia) or lower (hypotropia) than the fellow eye.
Poor blood supply to the nerve, pressure on the nerve or head injuries will cause limited eye movements and a squint.
Many things and/or events can cause a strabismus. They include genetics, inappropriate development of the "fusion center" of the brain, problems with the controlled center of the brain, injuries to muscles or nerves or other problems involving the muscles or nerves. Surprisingly, most cases of strabismus are not a result of a muscle problem, but are due to the control system -- the brain.
Treatment should be directed at the source of the problem. The eye doctor must determine if the strabismus is due to an eyeglass problem or brain problem. Sometimes, bifocals are needed to eliminate the eye turn and squint Surgery