News tagged with eye
Jumping spider uses fuzzy eyesight to judge distance
(PhysOrg.com) -- One of the ways in which humans determine distance is by estimating the sharpness of an image—closer objects produce a sharp image, while those further away are out of focus. For us, ...
Jan 27, 2012 |
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Deadly bird parasite evolves at exceptionally fast rate
A new study of a devastating bird disease that spread from poultry to house finches in the mid-1990s reveals that the bacteria responsible for the disease evolves at an exceptionally fast rate. What's more, ...
Feb 09, 2012 |
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A quantum connection between light and motion
(PhysOrg.com) -- Physicists have demonstrated a system in which light is used to control the motion of an object that is large enough to be seen with the naked eye at the level where quantum mechanics governs ...
Feb 06, 2012 |
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Discovery of 'bioelectric' arteries opens path to heart disease treatment
Bionic eyes and limbs made television's six million dollar man an icon, but new research suggests our existing biological structure already exhibits a valuable electrical property. Scientists have found that ...
Jan 30, 2012 |
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LED lights point shoppers in the right direction
Looking for an item in a large department store or mall can be like searching for a needle in a haystack, but that could change thanks to a hybrid location-identification system that uses radio frequency transmitters and ...
Jan 26, 2012 |
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Being ignored hurts, even by a stranger
(Medical Xpress) -- Feeling like you’re part of the gang is crucial to the human experience. All people get stressed out when we’re left out. A new study published in Psychological Science, a journal of the Associ ...
Medicine & Health / Psychology & Psychiatry
Jan 25, 2012 |
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Scientists keep their eyes on peripheral vision
(Medical Xpress) -- Two USC scientists are bringing peripheral vision into focus, showing that the way the brain sharpens its attention while the eyes are in motion leads to false assumptions about how objects ...
Medicine & Health / Neuroscience
Jan 20, 2012 |
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Fruit flies watch the sky to stay on course
Insects, equipped with complex compound eyes, can maintain a constant heading in their travels, some of them for thousands of miles. New research demonstrates that fruit flies keep their bearings by using ...
Jan 17, 2012 |
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Cell's 'battery' found to play central role in neurodegenerative disease
A devastating neurodegenerative disease that first appears in toddlers just as they are beginning to walk has been traced to defects in mitochondria, the 'batteries' or energy-producing power plants of cells.
Medicine & Health / Neuroscience
Jan 17, 2012 |
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Study: Babies try lip-reading in learning to talk
Babies don't learn to talk just from hearing sounds. New research suggests they're lip-readers too.
Medicine & Health / Psychology & Psychiatry
Jan 16, 2012 |
5 / 5 (1) |
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Aligning the eyes: A simpler surgery for a complex condition
People with strabismus (misalignment and limited movement of one or more eyes) are often teased about their crossed-eye appearance; those with more complex, disfiguring strabismus can become socially isolated and develop ...
30 minutes ago |
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Botox developer rues missing out on billions
Botox developer Alan Scott says he rues the day he handed over rights to the best-selling wrinkle-smoothing drug to a US company for just $4.5 million, saying he might have become a billionaire.
Medicine & Health / Medications
13 hours ago |
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East views the world differently to West
Cultural differences between the West and East are well documented, but a study shows that concrete differences also exist in how British and Chinese people recognise people and the world around them. Easterners really do ...
Other Sciences / Social Sciences
Feb 06, 2012 |
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Better than a needle in the eye: New medical device offers hope and relief for patients
(Medical Xpress) -- Researchers at McMaster have developed a new system for delivering drugs to the back of the eye - one that could offer more effective treatment while sparing patients with vision-related ...
Feb 02, 2012 |
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New gene discovery provides clue to brain, eye and lymphatic development
Researchers have found a new gene that, when mutated, can lead to lymphoedema (swollen limbs) as part of a rare disorder that can also cause problems with eye and brain development. This is the fourth lymphoedema-related ...
Jan 26, 2012 |
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Eye
Eyes 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.
