Blindness
Lecture available on: http://www.ihatepsm.com/resource/blindness
Definition of Blindness: WHO 2011
“Visual acuity of less than 3/60 (Snellen’s chart) or its equivalent”
Equivalent of < 3/60: Inability to count fingers in daylight at a distance of 3 meters
(3/60 is practically equivalent to counting fingers in daylight at a distance of 3 meters)
(Similarly, 1/60 is practically equivalent to counting fingers in daylight at a distance of 1 meters)
Leads to:
