1. Adelson, E.A., 1982, Saturation and adaptation in the rod system. Vision Res., 22: 299.
2. Aguilar, M. and Stiles, W.S., 1954, Saturation of the rod mechanism of the retina at high levels of stimulation. Optica Acta, 1: 59.
3. Birren, J.E. Bick, M.W. and Fox, C., 1948, Age changes in the light threshold of the dark adapted eye. J. Gerontol. 3: 267.
4. Boynton, R.M., 1979, Human Color Vision, Holt, Rinehart and Winston, New York.
5. Curcio, C.A., Allen, K.A. and Kalina, R.E., 1990, Reorganization of the human photoreceptor mosaic following age-related rod loss. (Abstract), Invest. Opthalmol. Vis. Sci. Suppl., 31: 38.