Figure 1.

(A) Fundus photo used as a secondary reference to confirm the identification of retinal veins (green arrows with unique tickmark pattern for each vein). Box shows OCT scan area. (B) En face structural OCT image. (C) Illustration showing that the three-dimensional volumetric OCT data were divided into 195 en face planes of 15-μm thickness. (D–G) En face Doppler OCT images. The enclosures outline automatically identified veins. Red enclosures identify the plane of maximum Doppler signal at which flow is measured for the enclosed vein section. Green and blue enclosures outline venous sections that were not used for flow measurement. Each branch vein is measured on only one plane to avoid duplicative flow measurement. Horizontal dotted line separates blood circulation into superior and inferior hemispheres.