Pupil Only Third Nerve Palsy

[@georgepetre2602]

Does unilateral INO cause exotropia?

[@kaego5798]

A unilateral INO can only cause exotropia when the affected eye is attempting to look in the direction of the lesion. E.g a right eye with INO will only be exotropic when it attempts to look towards the left due to the damaged medial longitudinal fasciculus. But in cases of primary gaze, an eye with unilateral INO will not cause exotropia. Although the eye may seem a little bit out of place in primary gaze ( a little shifted away from the nasal) it won't be so noticeable till attempt of gaze. The only condition an INO can present with manifest exotropia in primary gaze is when it's in combination with the sixth nerve nucleus of the same affected eye( the one and a half syndrome). Then, even in that case, it will be the contralateral eye that still has abduction tendencies that will displace outward. It's a lot of English but this is as much as I could understand from my studying. Hope it helps.

[@georgepetre2602]

@@kaego5798 Got it. Thank you!