Fig. 2.

A horizontal B-scan OCT image crossing the center of the optic nerve head disc was extracted from a 3D square scan ($512\times 128\times 2048\text{\hspace{0.17em}\hspace{0.17em}pixels}$, $6\times 6{\mathrm{mm}}^2$). (a) The en face view of the optic nerve head. The artery, vein, cup, and optic disc are clearly visualized. (b) B-scan OCT image. The cup and disc are clearly visible in the horizontal cross-sectional OCT image ($512\times 2048\text{\hspace{0.17em}\hspace{0.17em}pixels}$). (c) The B-scan OCT image ($512\times 2048\text{\hspace{0.17em}\hspace{0.17em}pixels}$) is marked to show the rim of the optic nerve and the cup-to-disc ratio (0.488).