DR P. MARAZZI / SCIENCE PHOTO LIBRARY DR P. MARAZZI / SCIENCE PHOTO LIBRARY
Convergent squint. Three-year-old boy with a convergent squint, also called esotropia. The left eye (right) is turned inwards towards the other eye. A squint (strabismus) occurs when there has been damage to the mechanism that aligns the eyes. In this case the squint arose after a flu-like viral illness, which may have affected one of the cranial nerves. In young children, squints cause double vision. If left untreated, this can lead to permanent loss of sight in one eye, because the brain corrects the double vision by ignoring one of the eyes. Treatment includes surgery, corrective glasses, and wearing a patch over the dominant eye.
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