Table 3 Classification of diabetic retinopathy
Level | Definition |
|---|---|
1 | No retinopathy |
1.5 | Retinal hemorrhages only, no microaneurysms |
2 | Micro aneurysms (1 or more) only |
3 | Micro aneurysms and 1 or more of the following: retinal hemorrhages, but total of hemorrhages and microaneurysms (H/MA) less than standard (STD) photograph 2A, hard exudates (HE) less than STD photograph 3, soft exudates (SE) questionably present; intraretinal microvascular (IRMA) abnormalities questionably present; venous beading (VB) questionably present; or small venous loops definitely present |
4 | Micro aneurysms and 1 or more of the following but definition of level 5 not met: H/Ma greater than or equal to STD photograph 2A, HE greater than or equal to STD photograph 3, SE definitely present, IRMA definitely present, VB definitely present; large venous loops or reduplication definitely present-- |
5 | IRMA definitely present in four peripheral fields and greater than or equal to STD photograph 8A in 2 or more fields; or, again in all 4 peripheral fields any three of the following: H/MA greater than or equal to STD photograph 2A in 1 field, SE definitely present in 2 or more fields, IRMA definitely present in 2 or more fields, or VB definitely present in 2 or more fields. |
6 | Fibrous proliferation or new vessels on or within 1 disc diameter (DD) of the disc graded less than photograph 10A, new vessels else where of any extent or pre retinal or vitreous hemorrhage, but level 7 definition not met |
7 | Diabetic Retinopathy Study (DRS) high-risk characteristics include one or more of the following: new vessels elsewhere greater than one-half disc area in any single photographic field and pre retinal hemorrhage or vitreous hemorrhage in any field; new vessels on or within 1 DD of the disc graded less than photograph 10A with pre retinal or vitreous hemorrhage; new vessels on or within 1 DD of the disc graded greater than or equal to photograph 10A with or without pre retinal or vitreous hemorrhage. |