Related topics: blood vessels , blindness
Eye
hideEyes are organs that detect light, and send signals along the optic nerve to the visual and other areas of the brain[citation needed]. Complex optical systems with resolving power have come in ten fundamentally different forms, and 96% of animal species possess a complex optical system. Image-resolving eyes are present in cnidaria, molluscs, chordates, annelids and arthropods.
The simplest "eyes", such as those in unicellular organisms, do nothing but detect whether the surroundings are light or dark, which is sufficient for the entrainment of circadian rhythms. From more complex eyes, retinal photosensitive ganglion cells send signals along the retinohypothalamic tract to the suprachiasmatic nuclei to effect circadian adjustment.
For more information about Eye, read the full article at
Wikipedia.
This text uses material from Wikipedia and is available under the GNU Free Documentation License.
News tagged with eye
Physicists Explain How Human Eyes Can Detect Quantum Effects
Sep 29, 2009 |
4.2 / 5 (46) |
19
(PhysOrg.com) -- By greatly amplifying one photon from an entangled photon pair, physicists have theoretically shown that human eyes can be used as detectors to observe quantum effects. Usually, detecting ...
Adjustable Fluidic Lenses for Eyesight Correction Applications
Feb 24, 2009 |
4.9 / 5 (7) |
3
(PhysOrg.com) -- Researchers from the University of Arizona have created a fluid-based opthalmic lens in which the amount of fluid can be constantly adjusted to provide customized eye correction. The lens may one day be incorporated ...
Researchers discover new 'golden ratios' for female facial beauty
Medicine & Health / Psychology & Psychiatry
Dec 16, 2009 |
4.3 / 5 (23) |
14
(PhysOrg.com) -- Beauty is not only in the eye of the beholder but also in the relationship of the eyes and mouth of the beholden. The distance between a woman's eyes and the distance between her eyes and ...
Gene therapy improves vision
Nov 23, 2009 |
4.8 / 5 (4) |
0
German scientist Paul Ehrlich found what he coined the "magic bullet" in the early 20th century upon developing the world’s first effective treatment of syphilis.
Dreams may have an important physiological function
Medicine & Health / Neuroscience
Nov 12, 2009 |
3.9 / 5 (27) |
12
(PhysOrg.com) -- Dreams have long been assumed to have psychological functions such as consolidating emotional memories and processing experiences or problems, but according to a Harvard psychiatrist and sleep ...
Two Retinal Imaging Display Devices at Prototype Stage
Electronics / Consumer & Gadgets
Oct 30, 2009 |
4.9 / 5 (28) |
9
(PhysOrg.com) -- NEC and Brother are both developing wearable prototype devices that use Retinal Imaging Display (RID) technology to project images directly on the wearer's retina. NEC's gadget is designed ...
Researchers discover mechanism that helps humans see in bright and low light
Medicine & Health / Neuroscience
Oct 13, 2009 |
4.9 / 5 (9) |
0
Ever wonder how your eyes adjust during a blackout? When we go from light to near total darkness, cells in the retina must quickly adjust. Vision scientists at Washington University School of Medicine in St. ...
Stimulating sight: New retinal implant developed
Sep 23, 2009 |
4.9 / 5 (19) |
2
(PhysOrg.com) -- Inspired by the success of cochlear implants that can restore hearing to some deaf people, researchers at MIT are working on a retinal implant that could one day help blind people regain a ...
Facial expressions show language barriers too
Medicine & Health / Psychology & Psychiatry
Aug 13, 2009 |
4.5 / 5 (11) |
8
(PhysOrg.com) -- People from East Asia tend to have a tougher time than those from European countries telling the difference between a face that looks fearful versus surprised, disgusted versus angry, and ...
Why we learn more from our successes than our failures
Medicine & Health / Neuroscience
Jul 29, 2009 |
4.1 / 5 (7) |
1
(PhysOrg.com) -- If you've ever felt doomed to repeat your mistakes, researchers at MIT's Picower Institute for Learning and Memory may have explained why: Brain cells may only learn from experience when we ...
Interactive Data Eyeglasses
Jun 02, 2009 |
4.5 / 5 (11) |
8
(PhysOrg.com) -- The data eyeglasses can read from the engineer's eyes which details he needs to see on the building plans. A CMOS chip with an eye tracker in the microdisplay makes this possible. The eyeglasses ...
Discoveries shed new light on how the brain processes what the eye sees
Medicine & Health / Neuroscience
Jun 02, 2009 |
5 / 5 (4) |
0
Researchers at the Center for Molecular and Behavioral Neuroscience (CMBN) at Rutgers University in Newark have identified the need to develop a new framework for understanding "perceptual stability" and how ...
Small evolutionary shifts make big impacts, study finds
May 20, 2009 |
4.6 / 5 (8) |
0
(PhysOrg.com) -- In the developing fetus, cell growth follows a very specific schedule. In the eye's retina, for example, cones -- which help distinguish color during the day -- develop before the more light-sensitive ...
Scientists discover neurons that 'mirror' the attention of others
Medicine & Health / Neuroscience
May 18, 2009 |
4.8 / 5 (5) |
2
Whether a monkey is looking to the left or merely watching another monkey looking that way, the same neurons in his brain are firing, according to researchers at the Duke University Medical Center.
New technique that scrambles light may lead to sharper images, wider views
Apr 21, 2009 |
4.4 / 5 (15) |
3
When photographers zoom in on an object to see it better, they lose the wide-angle perspective -- they are forced to trade off "big picture" context for detail. But now an imaging method developed by Princeton ...
