Table 1.

Diabetic retinopathy (DR) grading based on the National Health Service Grading Classification System [17] with follow-up recommendations adapted from the American Academy of Ophthalmology [18]

Grade	Description	Recommendation
R0	No diabetic retinopathy	Re-evaluate in twelve months with either eye care provider or photographic screening
R1	Background DR	Refer to eye care provider
R2	Pre-proliferative DR	Refer to ophthalmologist promptly
R3	Proliferative DR	Refer to ophthalmologist promptly
M	Maculopathy	Refer to ophthalmologist promptly
P	Photocoagulation	Refer to eye care provider
U	Unclassifiable/Ungradable	Refer to eye care provider