Table 5 Comparison between visual impairment estimates in the world using existing definitions and estimates using revised definitions.
Number of persons in the world with blindness | Number of persons in the world with visual impairment less severe than blindness | |
|---|---|---|
Estimates made by WHO using existing ICD definitions [5] | 37 million with blindness (best-corrected visual acuity less than 3/60 in the better eye) | 124 million with low vision (best-corrected visual acuity less than 6/18 to 3/60 in the better eye) |
Estimates by us using the proposed revised ICD definitions | 57 million with blindness (presenting visual acuity less than 6/60 in the better eye) | 202 million with moderate visual impairment (presenting visual acuity less than 6/18 to 6/60 in the better eye) |