Biophotons Contribute to Retinal Dark Noise

Imaging biophotonic activity in rat and bullfrog retinas. A Representative regular image of a whole rat retina. B–G Representative biophoton gray images (B-D) and corresponding biophoton number images (E–G) at 34, 36, and 38 °C. H Representative regular image of a whole bullfrog retina. I–N Representative biophoton gray images (I–K) and corresponding biophoton number images (L–N) at 34, 36, and 38 °C. Each image in B–G and I–N was obtained from the merger of 90 continuously-processed original gray images or biophoton number images (1-min imaging time for each original image). Temperatures (34, 36 and 38 °C) indicated in B, C, and D are the same for E, I, and L; F, J, and M; and G, K, and N, respectively. Scale bars 1 mm for A and H