Figure 2.

(A) Colour photograph of the left optic disc showing a sharply delineated, colobomatous excavation of the inferior half of the disc (asterisk) and a pit which is seen as a greyish focal depression on the temporal edge of disc (arrow). (B) The positions of the horizontal and vertical line scans corresponding to (C) and (D) are shown. (C) Horizontal line scan through the pit showing a narrow tract (arrows) extending deep into the lamina cribrosa. (D) Vertical scan though the disc showing an excavation in the inferior portion of the disc (asterisk) with herniation of the dysplastic retina (lacy appearance) (arrow).