Table 1.

Diabetic retinopathy severity scale in knowledge-based collaborative module.

Grade	Description of Diabetic Retinopathy [4]	Description in KC-Net
DR 0	No abnormalities	No abnormalities
DR 1	Microaneurysms only	Microaneurysms only
DR 2	Beyond mere microaneurysms yet less than severe nonproliferative DR	Microaneurysms, less than 20 hemorrhages and hard exudates
DR 3	> 20 intraretinal hemorrhages in each of 4 quadrants; Venous beading in 2+ quadrants microvascular abnormalities in 1+ quadrant; Absent indications of proliferative retinopathy	Soft exudates, hard exudates, more than 20 hemorrhages
DR 4	Presence of either neovascularization or vitreous/preretinal hemorrhage	Neovascularization, preretinal/vitreous hemorrhage