1. Early Studies of the Photostasis Phenomenon: Retinal Adaptation to the Light Environment -- 2. Light History and Photostasis: What Is a ?쏯ormal??Rat Retina? -- 3. Hints of Photostasis in Invertebrates -- 4. Regulation of Rhodopsin Expression in Rhabdomeral Photoreceptors: Functional Analysis of the? Flanking Region of the Calliphora Rh1 Opsin Gene -- 5. Rod Outer Segment (ROS) Renewal: An Underlying Mechanism for Maintaining Photostasis -- 6. Environmental Light and Age-Related Changes in Retinal Proteins -- 7. The Origin of the Major Rod- and Cone-Driven Components of the Rodent Electroretinogram and the Effect of Age and Light-Rearing History on the Magnitude of These Components -- 8. Effects of Photoresponse Prolongation on Retinal Rods of Transgenic Mice -- 9. Photostasis: Implications for Pineal, Circadian, and Visual Photosensitivity -- 10. Circadian Regulation of Vertebrate Photoreceptors: Rhythms in the Gating of Cationic Channels -- 11. Photoreceptor Development and Photostasis -- 12. Photostasis and Beyond: Where Adaptation Ends -- 13. Photostasis in Plants: Mechanisms and Regulation.