This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Ophthalmology
III nerve palsy causes all of the following except - 
Select and explain. 
A. Ptosis, B. Mydriasis, C. Medial deviation of eyeball, D. Pupillary reflex lost
C: Medial deviation of eyeball
Answer: C: Medial deviation of eyeball 
Explanation: Features of 3rd(occulomotor) nerve palsy

Paralysis of superior rectus, inferior rectus, medial rectus and inferior oblique. Eye is down and out due to unopposed action of superior oblique and lateral rectus. Medial & upward gaze is not possible.
Paralysis of sphinctor pupillae → Loss of ipsilateral direct and consensual pupillary light reflex and there is
	mydriasis.
Paralysis of ciliary muscle → Paralysis of accommodation.
Two extraocular muscles are spared :-



Superior oblique: - Intorsion, abduction and depression remain active.
Lateral rectus: - Abduction remains active. So eye is deviated lateraly.

Paralysis of levator palpabrae superioris → Ptosis