News tagged with retina
The neural machinery underlying our olfactory sense continues to be an enigma for neuroscience. A recent review in Neuron seeks to expand traditional ideas about how neurons in the olfactory bulb might encode information about ...
Neuroscience May 17, 2013 | 4 / 5 (1) | 0 |
(Medical Xpress)—Blind mice can see again, after Oxford University researchers transplanted developing cells into their eyes and found they could re-form the entire light-sensitive layer of the retina.
Ophthalmology Jan 08, 2013 | 5 / 5 (10) | 0 |
An experimental treatment for blindness, developed from a patient's skin cells, improved the vision of blind mice in a study conducted by Columbia ophthalmologists and stem cell researchers.
Medical research Oct 01, 2012 | 5 / 5 (3) | 1 |
Team deciphers retina's neural code for brain communication to create novel prosthetic retinal device for blind
(Medical Xpress) -- Two researchers at Weill Cornell Medical College have deciphered a mouse's retina's neural code and coupled this information to a novel prosthetic device to restore sight to blind mice. The researchers ...
Medical research Aug 13, 2012 | 5 / 5 (24) | 11 |
A team of University of California, Berkeley, scientists in collaboration with researchers at the University of Munich and University of Washington in Seattle has discovered a chemical that temporarily restores some vision ...
Neuroscience Jul 25, 2012 | 5 / 5 (2) | 3 |
(Medical Xpress) -- For the first time, scientists at the University of Wisconsin-Madison have made early retina structures containing proliferating neuroretinal progenitor cells using induced pluripotent ...
Ophthalmology Mar 14, 2012 | 5 / 5 (4) | 0 |
The fact that certain smells cause us pleasure or disgust would seem to be a matter of personal taste. But new research at the Weizmann Institute shows that odors can be rated on a scale of pleasantness, and this turns out ...
Neuroscience Sep 26, 2011 | 5 / 5 (1) | 3 |
The human eye long ago solved a problem common to both digital and film cameras: how to get good contrast in an image while also capturing faint detail.
Medical research May 03, 2011 | 4.7 / 5 (7) | 1 |
There are more than 1 million blind people in the U.S., and about 100,000 of those lost their sight due to retinitis pigmentosa, a disease that destroys light-sensitive cells in the retina.
Medical research Apr 20, 2011 | not rated yet | 0 |
Researchers have discovered that using two kinds of therapy in tandem may be a knockout combo against inherited disorders that cause blindness. While their study focused on man's best friend, the treatment ...
Ophthalmology Apr 09, 2013 | 5 / 5 (3) | 0 |
Neurobiologists at the Friedrich Miescher Institute have been able to dissect a mechanism in the retina that facilitates our ability to see both in the dark and in the light. They identified a cellular switch ...
Neuroscience Mar 27, 2013 | 4.9 / 5 (7) | 0 |
(Medical Xpress)—For UCLA bioengineering professor Wentai Liu, more than two decades of visionary research burst into the headlines last month when the FDA approved what it called "the first bionic eye for the blind." ...
Ophthalmology Mar 25, 2013 | 5 / 5 (4) | 0 |
(Medical Xpress)—With every sunrise and sunset, our eyes make note of the light as it waxes and wanes, a process that is critical to aligning our circadian rhythms to match the solar day so we are alert during the day and ...
Neuroscience Mar 05, 2013 | 5 / 5 (1) | 0 |
An international group of researchers has discovered seven new regions of the human genome—called loci—that are associated with increased risk of age-related macular degeneration (AMD), a leading cause of blindness. The ...
Genetics Mar 03, 2013 | 5 / 5 (1) | 0 |
Researchers led by biomedical engineering Professor Shy Shoham of the Technion-Israel Institute of Technology are testing the power of holography to artificially stimulate cells in the eye, with hopes of ...
Medical research Feb 26, 2013 | 5 / 5 (3) | 0 |
The vertebrate retina is a light sensitive tissue lining the inner surface of the eye. The optics of the eye create an image of the visual world on the retina, which serves much the same function as the film in a camera. Light striking the retina initiates a cascade of chemical and electrical events that ultimately trigger nerve impulses. These are sent to various visual centers of the brain through the fibers of the optic nerve.
In vertebrate embryonic development, the retina and the optic nerve originate as outgrowths of the developing brain, so the retina is considered part of the central nervous system (CNS).. It is the only part of the CNS that can be imaged non-invasively in the living organism.
The retina is a complex, layered structure with several layers of neurons interconnected by synapses. The only neurons that are directly sensitive to light are the photoreceptor cells. These are mainly of two types: the rods and cones. Rods function mainly in dim light and provide black-and-white vision, while cones support daytime vision and the perception of colour. A third, much rarer type of photoreceptor, the photosensitive ganglion cell, is important for reflexive responses to bright daylight.
Neural signals from the rods and cones undergo complex processing by other neurons of the retina. The output takes the form of action potentials in retinal ganglion cells whose axons form the optic nerve. Several important features of visual perception can be traced to the retinal encoding and processing of light.
For more information about Retina, read the full article at
This text uses material from Wikipedia and is available under the GNU Free Documentation License.