**Terminology**

Disk perfusion: Refers to flow index and vessel density of the disk region. Flow index: Average decorrelation values provided by the SSADA algorithm. Focal loss volume (%): Describes the average focal loss of ganglion cells in the ganglion cell complex layer of the retina.

Global loss volume (%): Describes the average overall loss of ganglion cells in the ganglion cell complex of the retina.

Vessel density (%): Area occupied by blood vessels in any particular segment of the retina or ONH.

Vessel length density (%): Length of the vasculature divided by total image area.
