Table 1.
How non-proliferative retinopathy classification systems have evolved (adapted with permission from ref. [179] https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6587728/).
| Classification System | Classification | |||||
|---|---|---|---|---|---|---|
| Airlie House 1968 (level) [300] | (0)None | (1) Mild to Moderate | (2) Moderate to severe | |||
| ETDRS, 1991 (level) [277] | (10) Diabetic retinopathy absent | (20) Microaneurysms only | (35) Mild non proliferative retinopathy | (43) Moderate non proliferative retinopathy | (47) Moderately severe non proliferative retinopathy | (53 A-D) Severe non proliferative retinopathy |
| ICDRSS, 2003 (level) [278] | No apparent retinopathy | Mild non proliferative retinopathy | Moderate non proliferative retinopathy | Severe non proliferative retinopathy | ||
| National Screening Committee UK, 2003 (level) [275] | (R0) None | (R1) Background diabetic retinopathy | (R2) Pre proliferative diabetic retinopathy | |||
| SDRGS, 2003 (level) [301] | (R0) None | (R1) Mild background diabetic retinopathy | (R2) Moderate background diabetic retinopathy | (R3) Severe background diabetic retinopathy | ||
| DR Deep Learning Algorithm, 2016 [297] | NA | Moderate non proliferative retinopathy | Severe non proliferative retinopathy | |||
ICDRSS International Clinical Diabetic Retinopathy Disease Severity Scale, SDRGS Scottish Diabetic Retinopathy Grading Scheme.