This diagram of the retina, drawn by Santiago Ramon y Cajal in 1892, comes from Web Vision, a comprehensive overview of the organization of the mammalian retina and visual system compiled by Drs. Helga Kolb, Eduardo Fernandez and Ralph Nelson of the John Moran Eye Center at the University of Utah.
The site is arranged like a book and contains 14 parts. It covers the anatomy, physiology, development and regeneration of retinal circuitry; the primary visual cortex, colour vision and visual psychophysics; and the clinical electrophysiology of various retinal degenerative diseases. It also contains many illustrations, animations and Quicktime movies.
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An Autonomous Circadian Clock in the Inner Mouse Retina Regulated by Dopamine and GABA:
Retinal is a pigment in your eyes that is necessary for vision. This is why vitamin A is so essential for vision - retinal is just one oxidation state up from retinol or one down from retinoic acid.
Guest Blogger Danio:
LiveScience has a nifty list. From an artificial hippocampus - the part of the brain that helps with short-term memory-, to Retinal Prosthesis or bionic eyes - electrodes implanted in the eye that help people who've lost
Here is something quite similar: the students website for the "sensation and perception" textbook by Wolfe has good materials on the same topic.