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Table 1 Definitions of blindness and partial sight used on BD8 certificates (apply to the better eye)

From: Leading causes of certification for blindness and partial sight in England & Wales

Blindness   Partial Sight  
Legal definition so blind that they cannot do any work for which eyesight is essential Definition (there is no legal definition) substantially and permanently handicapped by defective vision caused by congenital defect, illness or injury
Recommendations: worse than 3/60 (corrected visual acuity)
or
worse than 6/60 with very contracted visual fields
or
6/60 or above with a very contracted visual field especially in the lower part of the field
Recommendations 3/60 or 6/60 with full visual field
or
6/24 or worse with moderate constriction of visual field
or
6/18 or better with gross visual field defects