The WHO definition for blindness is the inability of counting fingers in daylight at a minimum distance of -
WHO definition blindness - inability to count fingers in day light at a distance of 3 metres or visual acuity less than 3/ 60 or its equivalent. Ref- Park&;s textbook of Preventive and social medicine 23rd edition. .
3 feet
6 feet
3 metres
6 metres
Non communicable diseases