Table 6. Quantitative and qualitative evaluation of vessel continuity, vessel visibility and presence of artefacts in the SS-OCTA images.

Layer	Parameters	Pre-operative	Post-operative	P value
SCP	Motion artefacts	-54	8	.061
	N of motion artefacts	4.77 ± 2.09	3.00 ± 2.94	.089
	Image artefacts	23	85	.077
	Distinguishability of FAZ	-23	77	< .001*
	Continuity of small vessels	-38	33	.028*
	Continuity of large vessels †	-46	62	.003*
	N of bifurcations †	.923 ± .760	1.62 ± .290	.082
DCP	Motion artefacts	-31	23	.133
	N of motion artefacts	3.15 ± 1.86	1.84 ± 1.91	.080
	Image artefacts	23	85	.077
	Distinguishability of FAZ	-62	-8	.026*
	Continuity of small vessels	-77	23	.003*

FAZ = fovea avascular zone; SCP = superficial capillary plexus; DCP = deep capillary plexus; N = number.

The consensus grading contained an individual score for each feature of each image. Individual scores ranged from -1/0/+1, and were then summed up and normalized to a final score as presented in the Table. The maximal and minimal possible final scores ranged from -100 to +100. P-values were calculated by Pearson’s χ² test. Number of motion artifacts and bifurcations were also analyzed and presented as means ± standard deviations in the Table. P-values were calculated by Student’s t-test.

*P < .05.

^† Continuity of large vessels and number of bifurcations were only graded in SCP images.