Fig. 1
From: Minification of fundus optical coherence tomographic images in gas-filled eye
Measurement of the vertical length and horizontal width of the optic disc. The size of optic disc was measured in the Optic Disc Cube (200 x 200) images of the Cirrus HD-OCT. Because the spacing of each slice is 30 μm, the length of the optic disc was calculated as: Length of optic disc = Number of scan X 30μm. Because the number of scans is 50 (i.e.,121-71) in this case, the vertical length of optic disc is 1500 μm