Case definitions pertaining to the person
| Case label | Description |
| DMO | Diabetic macular oedema (any severity) in one or both eyes. |
| CSDMO-SL | Sight loss (CVA <6/6) attributable to DMO, in at least one eye. |
| CSDMO-VI | CVA <6/6 to >6/60 attributable to DMO, in at least one eye. A subgroup of CSDMO-SL who are not blind. Considered as potential candidate for referral to hospital for assessment/treatment. |
| CSDMO-BL | CVA ≤6/60 in both eyes, one or both attributable to DMO. A subgroup of CSDMO-SL, with blindness due to DMO. Considered as candidate for low vision and rehabilitation services, registration and social care. |
| CSDMO-PS | CVA <6/19 to >6/60 in the better seeing eye, the impairment attributable to DMO in one or both eyes. The fellow eye may be equally affected or may have poorer vision. A subgroup of CSDMO-VI who may use social care, low vision and rehabilitation services, in addition to hospital assessment/treatment for DMO. |
BL, blindness; CSDMO, clinically significant diabetic macular oedema; CVA, corrected visual acuity; DMO, diabetic macular oedema; PS, partial sight; SL, sight loss; VI, visual impairment.