<prompt> WHO definition of blindness, Visual acuity -66036061869  <response>: Ans. is b i.e., 360 o WHO defines blindness as Visual acuity of 360 in better eye with best possible correction.Categories of visual impairmentCategories of visual impairmentVisual acuityMaximum less thanMinimum equal to or better thanLow vision1. 6182. 660660360Blindness3. 360 finger counting at 3 metres4. 160 finger counting at 1 metre5. No light perception160 finger counting at 1 metres light perception 