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Table 3 Our recommendation for the categories of severity of visual impairment in the International Statistical Classification of Diseases.

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

Category of visual impairment Presenting visual acuity Or central visual field* Classified as
  Maximum less than Minimum equal to or better than   
1 6/12
0.50
20/40
6/18
0.33
20/60
  Mild visual impairment
2 6/18
0.33
20/60
6/60
0.10
20/200
  Moderate visual impairment
3 6/60
0.10
20/200
3/60
0.05
20/400
20° or less but more than 10° Blindness
4 3/60
0.05
20/400
1/60 (finger counting at 1 metre)
0.02
5/300 (20/1200)
10° or less but more than 5° Severe blindness
5 1/60 (finger counting at 1 metre)
0.02
5/300
Light perception 5° or less Very severe blindness
6 No light perception   Total blindness
9 Unspecified   Unspecified
  1. *Visual field restriction criteria applicable even if visual acuity is better than for that category of visual impairment.