Aetiology
Causes of a lateral rectus paresis include:
- VI nerve - abducens - palsy
- internuclear ophthalmoplegia, i.e. lesion in the brainstem
Sixth nerve palsy and internuclear ophthalmoplegia can be distinguished; the limit of abduction is the same with monocular or binocular vision with a VI nerve palsy, whilst the eye will abduct a little further on monocular testing with an internuclear ophthalmoplegia.
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