Convergent squint. Close-up of a child's face showing a convergent squint. The left eye (right) is turned inwards towards the other eye. A squint (strabismus) occurs when there has been a break- down in the development of the mechanism that al- igns the eyes. 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, correct- ive glasses, and wearing a patch over the dominant eye to maintain sight in the weaker eye.

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