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 |
Study finds tailored diabetes education programs can benefit African, Latin American women who are higher risk
A new study led by Ryerson University provides guidelines on how best to deliver diabetes self-management education programs to women in Black/Caribbean and Latin American communities – gender and ethnic ...
Diabetes Apr 26, 2013 | 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 |
The image of an object, when projected into the eyes, may take on the most diverse shapes depending on the chosen point of view, as this can change its distance, perspective and so on, yet generally we have no difficulty ...
Neuroscience Apr 04, 2013 | 4 / 5 (1) | 0
Using new technology and new approaches, researchers at Lund University in Sweden hope to be able to explain why people suffer vision loss in eye diseases such as retinal detachment and glaucoma.
Ophthalmology Apr 03, 2013 | 5 / 5 (1) | 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 |
New results from a prospective clinical trial conducted in France show that children with low-risk retinoblastoma do not need postoperative (adjuvant) chemotherapy to prevent disease recurrence or metastasis; the results ...
Cancer Mar 04, 2013 | not rated yet | 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 |
Retinal implants with wireless microchip restore functional vision in retinitis pigmentosa patients, research finds
(Medical Xpress)—Retina Implant AG, the leading developer of subretinal implants for patients blinded by retinitis pigmentosa (RP), announced results from part of its multicentre study were published today in the peer-reviewed ...
Ophthalmology Feb 20, 2013 | not rated yet | 0 |
The U.S. Food and Drug Administration (FDA) granted market approval to an artificial retina technology today, the first bionic eye to be approved for patients in the United States. The prosthetic technology ...
Ophthalmology Feb 14, 2013 | 5 / 5 (9) | 0 |
Scientists at Queen's University Belfast are hoping to develop a novel approach that could save the sight of millions of diabetes sufferers using adult stem cells.
Medical research Feb 14, 2013 | not rated yet | 0
After years of research, the first bionic eye has seen the light of day in the United States, giving hope to the blind around the world.
Ophthalmology Feb 05, 2013 | 4.5 / 5 (11) | 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.
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