Strabismus (squint) is caused because of a lack of muscle co-ordination between the eyes, causing the eyes to point in different directions.
The eyes are unable to focus simultaneously on a single point.
Most common types are:
- Exotropia - outward turning of the eyes
- Esotropia - the eyes are 'crossed'
Strabismus may result from problems with the extra ocular muscles, blindness, mechanical problems in the eye, or mechanical obstruction to vision in one eye during early life.
In adults, strabismus may be a symptom of variaous brain disorders or systemic diseases. Squint surgery aims at re-aligning the eye muscles.