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.
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News tagged with eye
Small Fingers More Touch Sensitive
Medicine & Health / Neuroscience
1hour ago |
4 / 5 (1) |
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When it comes to finger sensitivity, bigger isn't always better.
Researchers discover new 'golden ratios' for female facial beauty
Medicine & Health / Psychology & Psychiatry
3 hours ago |
5 / 5 (3) |
4
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 her mouth are key factors in determining ...
Why England's soccer team keeps losing on penalties
Medicine & Health / Psychology & Psychiatry
Dec 11, 2009 |
4.2 / 5 (5) |
3
A new study may explain why the England soccer team keeps losing in penalty shootouts - and could help the team address the problem in time for the World Cup 2010. Research by the University of Exeter shows ...
New inherited eye disease discovered
Dec 11, 2009 |
5 / 5 (1) |
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University of Iowa researchers have found the existence of a new, rare inherited retinal disease. Now the search is on to find the genetic cause, which investigators hope will increase understanding of more ...
Gene therapy improves vision
Nov 23, 2009 |
4.8 / 5 (4) |
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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.
Physicists Explain How Human Eyes Can Detect Quantum Effects
Sep 29, 2009 |
4.2 / 5 (46) |
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(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 ...
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 ...
Over-the-counter eye drops raise concern over antibiotic resistance
Medicine & Health / Medications
Nov 27, 2009 |
3.8 / 5 (4) |
2
(PhysOrg.com) -- The use of antibiotic eye drops for conjunctivitis has increased by almost half since they became available over the counter at chemists in 2005, data obtained by Oxford University researchers ...
Two molecules affecting brain plasticity
Medicine & Health / Neuroscience
Nov 25, 2009 |
4.9 / 5 (8) |
1
(PhysOrg.com) -- You wouldn't want a car with no brakes. It turns out that the developing brain needs them, too.
Scientists rescue visual function in rats using induced pluripotent stem cells
Dec 03, 2009 |
5 / 5 (2) |
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An international team of scientists has rescued visual function in laboratory rats with eye disease by using cells similar to stem cells. The research shows the potential for stem cell-based therapies to treat ...
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 ...
The changing pattern of childhood blindness in developing countries
Dec 08, 2009 |
not rated yet |
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"Changing patterns of global childhood blindness suggest a reassessment of research, training, and programmatic needs," says a team of eye specialists from India, Malawi, and Tanzania.
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 ...
Stimulating sight: New retinal implant developed
Sep 23, 2009 |
4.9 / 5 (19) |
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(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 ...
