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The reason for putting prism in spectacles is to reduce diplopia (double vision) in people who have strabismus (a muscle imbalance that prevents them from maintaining fixation on an object). In cases where the muscle imbalance is mild, the problem can sometimes be overcome by "training" the muscles that are weak by performing exercises as prescribed by an Ophthalmologist. These are sometimes referred to as "pencil push-ups". For example, if a patient has an exotropia (the eyes turn outwards or away from the nose, the ophthalmologist will get the patient to fixate on a pencil while having them move it closer then farther away from their nose in a repetitive fashion. This forces the eyes to go "cross-eyed" and strengthens the medial muscles.

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Q: What does a prism in spectacles do?
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