A squint, also called strabismus, is where the eyes point in different directions. It’s particularly common in young children, but can occur at any age. One of the eyes may turn in, out, up or down while the other eye looks ahead. Sometimes the squint cannot be corrected using spectacles but by only correcting or straightening the eye muscles called as extra ocular muscles. There are six extra ocular muscles; four recti muscles and two oblique muscles.
To make the patient understand, what is done during surgery, here is a simple model of the eye ball which is attached by extra ocular muscles represented by elastic bands. One can demonstrate to the patient, how the muscles can be corrected to correct squint by this model.

Biomedical Engineering Department
Aravind Eye Hospital, Madurai