Figure 2.

Visual acuity loss at two years as a function of baseline visual acuity for all 91 subjects with a two-year follow-up visit after baseline, stratified by baseline low luminance deficit (LLD). 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 open squares indicate eyes with a lesser baseline deficit under reduced luminance conditions (better LLD), while the solid diamonds indicate eyes with a greater deficit under reduced luminance conditions (worse LLD). Visual acuities are graphed in logMAR (logarithm of the minimum angle of resolution) notation, with some Snellen equivalents written below.