Fig. 4. Receiver operating characteristic curves showing performance of DeepDR-Transformer alone versus PCPs (when unassisted and assisted by DeepDR-Transformer) in identifying referable DR.
a, Standard fundus images (500 eyes: 250 nonreferable eyes and 250 referable eyes) graded by PCPs in the urban area. b, Portable fundus images (500 eyes: 250 nonreferable eyes and 250 referable eyes) graded by PCPs in the urban area. c, Standard fundus images (500 eyes: 250 nonreferable eyes and 250 referable eyes) graded by PCPs in the rural area. d, Portable fundus images (500 eyes: 250 nonreferable eyes and 250 referable eyes) graded by PCPs in the rural area.