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
The changing pattern of childhood blindness in developing countries
Dec 08, 2009 |
not rated yet |
0
"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.
Scientists rescue visual function in rats using induced pluripotent stem cells
Dec 03, 2009 |
5 / 5 (1) |
0
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 ...
Brandeis studies evaluate visionary approach to improving eyesight
Dec 02, 2009 |
not rated yet |
0
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) |
1
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, ...
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 ...
Managing doctors' practices made easier with new software
Nov 25, 2009 |
4 / 5 (2) |
0
(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.
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.
Eye floaters and flashes of light linked to retinal tear, detachment
Nov 24, 2009 |
5 / 5 (1) |
0
Suddenly seeing floaters or flashes of light may indicate a serious eye problem that - if untreated - could lead to blindness, a new study shows.
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.
Finding a protective mechanism for retinal cells could save sight
Nov 16, 2009 |
5 / 5 (2) |
0
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 ...
Study finds many people with hemianopia have difficulty detecting pedestrians while driving
Nov 12, 2009 |
not rated yet |
0
Schepens Eye Research Institute scientists have found that--when tested in a driving simulator--patients with hemianopia (blindness in one half of the visual field in both eyes) have significantly more difficulty 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 ...
On the cutting edge: Zigzag incision technique improves outcome of laser-assisted corneal transplantation
Nov 10, 2009 |
5 / 5 (2) |
0
(PhysOrg.com) -- For most of the 40,000 Americans who undergo corneal transplants each year, recovery is uncomfortable and slow, sometimes taking as long as six months. Even then, clear vision may not be fully ...
Cataract surgery does not appear associated with worsening of age-related macular degeneration
Nov 09, 2009 |
not rated yet |
0
Age-related macular degeneration does not appear to progress at a higher rate among individuals who have had surgery to treat cataract, contrary to previous reports that treating one cause of vision loss worsens the other, ...
Researchers find new way to attack inflammation in Graves' eye disease
Nov 06, 2009 |
not rated yet |
0
A small group of patients with severe Graves' eye disease experienced rapid improvement of their symptoms — and improved vision — following treatment with the drug rituximab. Inflammation around their eyes and damage to the ...
