This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Miscellaneous, Subject name: Ophthalmology
All are ophthalmological emergencies except - 
Select and explain. 
A. CRAO, B. CRVO, C. Acute congestive glaucoma, D. Endophthalmitis
B: CRVO
Answer: B: CRVO 
Explanation: in the late stages only macula shows marked pigmentary changes and neovascularisation. REF:khurana,pg no 271