Figure 11: Confocal scanning laser tomographic image of posterior segment of the eye shows topography of optic nerve head and of surrounding retinal surface in three dimensions. In less than 2 seconds, the 670-nm laser performed a sequence of 64 scans of the retina over a 15° x 15° field, creating 64 386 x 386-pixel planar images out of light reflected from different depths. The shape of the indentation edge, emphasized by the drawn green line, indicates nerve fiber layer defect at the rim of the optic nerve head. (Image courtesy of Heidelberg Engineering, Dossenheim, Germany.)