Table 2.

Image quality scoring criteria

Type	Image quality specification	Score
Artifact	no artifacts	0
	artifacts are outside the aortic arch with scope less than ¼ of the image	1
	artifacts do not affect the macular area with range less than ¼	4
	artifacts cover more than ¼ but less than ½ of the image	6
	artifacts cover more than ½ without fully covering the posterior pole	8
	cover the entire posterior pole	10
Clarity	clarity only level I vascular arch is visible	1
	level II vascular arch and a small number of lesions are visible	4
	level III vascular arch and some lesions are visible	6
	level III vascular arch and most lesions are visible	8
	level III vascular arch and all lesions are visible	10
Field definition	field definition do not include the optic disc and macula	1
	only contain either optic disc or macula	4
	contain optic disc and macula	6
	the optic disc or macula is outside the 1 papillary diameter and within the 2 papillary	8
	diameter range of the center
	the optic disc and macula are within 1 papillary diameter of the center	10
Overall quality	quality is not good enough for the diagnosis of retinal diseases	0
	quality is good enough for the diagnosis of retinal diseases	1