Double Vision

A single object being viewed is seen as two images each of normal clarity. Almost all forms of double vision are relieved by closing one eye.

Double vision in an adult, especially if of rapid onset, is usually due to loss of function in one or more of the nerves that control eye movements, usually the VIth cranial nerve (images side by side), occasionally the IIIrd nerve (especially if eyelid drooping or pupil large) or IVth nerve (images one above the other or oblique). Cranial nerve palsy.

Slower, progressive onset, or intermittent double vision may indicate a problem in the eye socket such as thyroid eye disease or orbital tumour or orbital inflammation

Double vision is occasionally present in children with squint

Rare causes include:

Myasthenia gravis

Trauma

Stroke