This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Acoustic Neuroma, Subject name: ENT
Earliest ocular finding in acoustic neuroma:(PGI 2000; MP 2000; KERALA 2004; DELHI 2006) 
Select and explain. 
A. Diplopia, B. Ptosis, C. Inability to close eye, D. Loss of corneal sensation
D: Loss of corneal sensation
Answer: D: Loss of corneal sensation 
Explanation: (d) Loss of corneal sensation(Ref. Scott Brown, 8th ed., Vol 2 page 1371)Involvement of 3rd cranial nerve causing diplopia and ptosis is not described in Acoustic neuroma.Motor involvement of facial and thereby inability to close eye occurs uncommonly and that too very late in Acoustic neuroma.Papilloedema because of increased intracranial pressure occurs in the terminal stage of Acoustic neuroma.