<prompt> WHO definition of blindness?visual acuity less than 360 or its equivalentvisual acuity less than 160 or its equivalentvisual acuity less than 618 or its equivalentvisual acuity less than 660 or its equivalent  <response>: Answer: A. visual acuity less than 360 or its equivalent. Ref. Parks Textbook of PSM 22ndPg.371WHO defines blindness as visual acuity of less than 360Snellen or its equivalent. WHO added that inability to count fingers in daylight at a distance of 3 m.Categories Of Visual ImpairmentMaximum Visual Acuity Less ThanMinimum Visual Acuity Equal To Or Better ThanLow vision1. 618660 2. 660350Blindness3. 360 finger counting at 3 metres160 finger counting at 3 metres 4. 160 finger counting at 3 metres5. No light perceptionLight perception 