Fig. 1

Blue light and green light fundus autofluorescence images with points of interest identified. Fundus autofluorescence images acquired with blue light (a) and green light (b) in a normal subject showing the identical points of interest measured in both images. For both images, the gray values obtained in the fovea (F), hypoautofluorescent point (HO), and hyperautofluorescent point (HR) were divided from the gray values in the optic disc (O) to calculate the autofluorescence signal ratios R1, R2, and R3 respectively