COMMENTS AND RESPONSES Influence of Flickering Light on the Retinal Vessels in Diabetic Patients Response to Nguyen, Cheung, and

W e thank Wong et al. (1) for theirinterest in our study (2) in whichwe showed that retinal vessels in diabetic patients with increasing stages of diabetic retinopathy experience a contin-uously decreasing response to flickering light. We believe that the issue raised by Wong et al. is very important. The study by Nguyen et al. (3) showed that arteriolar and venular cali-bers are structurally larger in patients with diabetes. In this study, retinal vessel diameter was measured from digital reti-nal photographs, a static vessels analysis. As previous studies showed the re-duced autoregulation of retinal vessels in diabetic patients without visible signs o