What is Sixth cranial nerve palsy of left eye causes and explain in detail?
(Refer: AK Khurana Comprehensive Ophthalmology, 6th edition, pg no. 336 - 361)Sixth nerve supplies lateral rectus, therefore its palsy results in abduction weakness (not adduction weakness).In left gaze, there is the abduction of left eye and adduction of the right eye. If there is paralysis of lateral rectus of the left eye (6th nerve paralysis), abduction of left eye will not be possible in left gaze, while adduction of the right eye is normal. Therefore, there will be diplopia in left gaze.