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Table 1 Categories of severity of visual impairment according to the International Statistical Classification of Diseases [1].

From: Revision of visual impairment definitions in the International Statistical Classification of Diseases

Category of visual impairment Visual acuity with best possible correction Or central visual field* Classified as
  Maximum less than Minimum equal to or better than   
1 6/18
3/10 (0.3)
20/70
6/60
1/10 (0.1)
20/200
  Low vision
2 6/60
1/10 (0.1)
20/200
3/60
1/20 (0.05)
20/400
  Low vision
3 3/60
1/20 (0.05)
20/400
1/60 (finger counting at 1 metre)
1/50 (0.02)
5/300 (20/1200)
10° or less but more than 5° Blindness
4 1/60 (finger counting at 1 metre)
1/50 (0.02)
5/300
Light perception 5° or less Blindness
5 No light perception   Blindness
9 Undetermined or unspecified   Unspecified
  1. *Visual field restriction criteria applicable even if visual acuity is better than for that category of visual impairment.