Also known as diplopia, the seeing of 2 instead of 1 visual image of a single object. It is usually a symptom of a squint, especially of paralytic squint, in which paralysis of 1 or more of the eye muscles impairs eye movement. Other causes include a tumour in the eyelid or a tumour or blood clot behind the eye. Double vision can also occur in exophthalmos, when the eyeballs protrude because of an underlying hormonal disorder. A child with squint needs treatment to prevent amblyopia (lazy eye). In adults double vision needs immediate investigation.
Double vision |
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