Cat responds to rotational optical illusion. The illusion in question. But why does it work? Link to the actual paper.
Sea urchins do not have eyes, yet appear to be able to see where they are going. One posible answer: they may use the entire surface of their bodies as a compound eye.
Recently, a man's sight was returned to him after losing it for 12 years. How did he do it? Surgeons drilled a hole through one of his canines, put a lens in it, and implanted the construct in his eye. [more inside]
Scientists in the USA have discovered [NYTimes] a new cell in the eye responsible for resetting the biological clock. Its being called "heretical".. Not every day, Dr. Provencio said, do scientists find a new body function.