Agreement amongst consultant ophthalmologists on levels of visual disability required for eligibility for certificate of sight impairment : Sight impairment registration using binocular composite visual fields.

Overall agreement was modest. Grading for SI showed the poorest levels of agreement. Using binocular fields does not appear to improve concordance for sight impairment registration. Moreover, there is no difference in agreement between glaucoma and non-glaucoma experts. An overall score for visual disability using mean deviation may be a more pragmatic approach.