Blindness is a state of being sightless or say an inability to see . World Health Organization - WHO (1972) describes blindness as the inability to count fingers at the distance of 3 meters in day-light after best possible spectacle correction in the better eye OR visual field less than 10° around the centre of fixation. Blindness is of three TYPES: Loss of visual acuity. Colour blindness: Inability to recognize colours, and Night blindness: Night vision is damaged.