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
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.
New inherited eye disease discovered
Dec 11, 2009 |
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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 ...
Why England's soccer team keeps losing on penalties
Medicine & Health / Psychology & Psychiatry
Dec 11, 2009 |
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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 ...
Over-the-counter eye drops raise concern over antibiotic resistance
Medicine & Health / Medications
Nov 27, 2009 |
3.8 / 5 (4) |
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(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) |
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(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 |
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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 ...
Eye floaters and flashes of light linked to retinal tear, detachment
Nov 24, 2009 |
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Suddenly seeing floaters or flashes of light may indicate a serious eye problem that - if untreated - could lead to blindness, a new study shows.
Finding a protective mechanism for retinal cells could save sight
Nov 16, 2009 |
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Determining what triggers the death of retinal cells, called photoreceptors, could hold the key to stopping blinding disorders caused by a wide range of eye diseases, Yale School of Medicine researchers report in the November ...
The changing pattern of childhood blindness in developing countries
Dec 08, 2009 |
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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.
Brandeis studies evaluate visionary approach to improving eyesight
Dec 02, 2009 |
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Joseph Balboni loves sports. An avid tennis player and golfer, as well as baseball fan, the 46-year-old insurance agent became increasingly frustrated over time as his eyesight dimmed due to keratoconus, a degenerative eye ...
Can heart disease treatments combat AMD?
Dec 01, 2009 |
3 / 5 (1) |
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Can treatments that reduce risks for cardiovascular disease (CVD) also help combat age-related macular degeneration (AMD), an eye disease that affects millions of Americans? CVD and AMD share some risk factors-such as smoking, ...
Managing doctors' practices made easier with new software
Nov 25, 2009 |
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(PhysOrg.com) -- A McMaster University-led research team has developed an innovative software tool that gives family doctors up-to-date information on their patients in two seconds or less.
