Skip to main content
. 2011 Jul 30;25(4):381–387. doi: 10.1016/j.sjopt.2011.07.003

Figure 7.

Figure 7

The Disc Damage Likelihood Scale (DDLS). This grading system is based on the radial width of the neuroretinal rim measured at its thinnest point. The unit of measurement is the rim/disc ratio, that is, the radial width of the rim compared to the diameter of the disc in the same axis. When there is no rim remaining, the rim/disc ratio is 0. The circumferential extent of rim absence (0 rim/disc ratio) is measured in degrees. For small discs (diameter <1.50 mm) the DDLS stage should be increased by 1; for large discs (diameter >2.00 mm) the DDLS stage should be decreased by 1.