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Until now, researchers have known only about three types of cells that animals in general use for vision. These three were considered to provide fish, mammals and birds with all the capabilities they needed for distinguishing color, depth and the difference between night and day. A new study has recently revealed that fish sport another type of light sensor, which is found in cells that were previously thought to only play a role in facilitating communication between specialized vision cells in the retina. “This is mind-boggling. For more than 100 years, it's been known that rod cells and cone cells are responsible for sensing light, and therefore, vision. Then, about seven years ago, another light sensor was discovered in the retina, revealing a third type of light-sensitive cells in mammals, so we set out to look at whether this was true in other vertebrates as well,†Johns Hopkins University School of Medicine Solomon H. Snyder Department of Neuroscience Professor o!
f Neurscience King-Wai Yau, PhD, explains. The newly identified retinal horizontal cells, which are in essence nerve cells that do not even communicate with the brain, were found when experts took a closer look at melanopsin light sensors, which are formations involved in vision that are not very active in mammals. In other types of an...
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http://news.softpedia.com/news/New-Light-Sensitive-Cell-Found-in-Fish-117611.shtml
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