Fig. 1

This figure depicts QCSF graphs for age matched subjects with contrast sensitivity on the y axis and spatial frequencies (in cpd) on the x axis. The graph on the left is from a patient with STGD; in the center from a patient with RCD; and on the right is from a control subject. The line is the best fitting contrast sensitivity function with the confidence interval shaded in grey. The green triangles represent the stimuli that the subject captured correctly, the red crosses represent the stimuli that the patient read incorrectly, and the black crosses represent the stimuli that the subject could not read altogether. The patients with STGD had the worst CS function (curve with lower values and smallest area) of all groups. We did not include a CS graph from a patient with Best disease since these patients had an almost identical CS function to patients with RCD