There are three categories of blindness and the person fell in these categories is called legaly blind.
B1 Players (Totally Blind)ll
No light perception in either eye up to light perception, but inability to recognise shape of a hand at any distance or in any direction.
B2 Players (Partially Blind)
From ability to recognise the shape of the hand up to a visual acuity of 2/60 or visual field of less than five degrees in the better eye after correction.
B3 Players (Partially Sighted)
From visual acuity above 2/60 up to visual acuity of 6/60 or a visual field of less that 20 degrees in better eye after correction.