Figure 1.

Visual acuity loss at two years as a function of baseline visual acuity for all 91 subjects with a two-year follow-up examination after baseline. Those points above the horizontal dashed line indicate at least moderate visual loss, and those points above the upper horizontal dotted line indicate severe visual loss. The solid line shows the univariate linear regression analysis (slope −0.28, p=0.0015). Visual acuities are graphed in logMAR (logarithm of the minimum angle of resolution) notation, with some Snellen equivalents written below.