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Table 5 Comparison between visual impairment estimates in the world using existing definitions and estimates using revised definitions.

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

  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)