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
The earliest change in glaucoma is: 
Select and explain. 
A. Papilloedema, B. Hazy cornea, C. Baring of the blind spot, D. Sickle scotoma
C: Baring of the blind spot
Answer: C: Baring of the blind spot 
Explanation: Ans. Baring of the blind spot