Figure 3.

Processing of optic nerve OCTA scans for measurement of whole-image VD, ONH VD, and peripapillary VD. The ONH segment (A) was used for assessment of the whole image and ONH VD. After the raw image was made binary and skeletonized (B), the scanning laser ophthalmoscopy (SLO) image was superimposed on the skeletonized image to trace the borders of the ONH (C). The area within the ONH borders was used to assess ONH VD (D). The RPC segment was used to assess peripapillary VD (E). The raw image was similarly made binary and skeletonized (F), and the SLO image was used to trace the borders of the ONH (G). A ring 0.5 mm in width around the ONH was selected, and the peripapillary VD was assessed within this ring (H).