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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.