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
According to WHO, blindness is defined as: September 2009, 2010 
Select and explain. 
A. Visual acuity of less than 1/60, B. Visual acuity of less than 3/60, C. Visual acuity of less than 6/60, D. Visual acuity of less than 6/18
B: Visual acuity of less than 3/60
Answer: B: Visual acuity of less than 3/60 
Explanation: Ans. B: Visual acuity of less than 3/60 As per WHO, blindness is defined as Visual acuity of less than 3/60 in the better eye with befit possible correction.