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
Campimetry (Scotometry) is performed in the visual field area of: 
Select and explain. 
A. 50deg, B. 30deg, C. 60deg, D. 90deg
B: 30deg
Answer: B: 30deg 
Explanation: Ans. 30deg