Light Stimulation Images (IMAGE) Optica Caption (A) and (B) show the OCT images for two different stimulus light intensities. (C) and (D) show plots of the corresponding functional signals of select rods and cones in the field to the visible stimuli. No cone elongation is visible in response to the dimmer flash in (C), whereas a clear rod response is visible. In response to the brighter flash in (D), both rods and cones elongate, with the elongation of rods having several times higher amplitude. Credit Mehdi Azimipour, UC Davis Eye Center. Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.