FIGURE 3.

Bar graph of average pixel intensities from patients with diabetic retinopathy (aged 56 to 68, n = 7), diabetics without retinopathy (aged 54 to 67, n = 7), and age-matched nondiabetic controls (aged 57 to 67, n = 7). Patients with diabetes demonstrated significantly increased retinal flavoprotein autofluorescence (FA) pixel intensity compared to nondiabetic control volunteers (P = .001). Diabetics with retinopathy demonstrated yet higher intensities of retinal FA compared to diabetics without retinopathy (P = .04). gsu, grayscale units.