<prompt> According to WHO, blindness is defined as: September 2009, 2010Visual acuity of less than 160Visual acuity of less than 360Visual acuity of less than 660Visual acuity of less than 618  <response>: Ans. B: Visual acuity of less than 360 As per WHO, blindness is defined as Visual acuity of less than 360 in the better eye with befit possible correction. 