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
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 ...
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, ...
Brandeis studies evaluate visionary approach to improving eyesight
19 hours ago |
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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 ...
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Gift Guide: Tech books that enlighten, entertain
14 hours ago |
1 / 5 (1) |
0
(AP) -- Your holiday shopping list probably includes gadgets, games and gizmos that illustrate how technology is changing the way we work, play and communicate. So why not throw in a few books about the people and services ...
Review: Two new 3-D laptops still feel shallow
Electronics / Consumer & Gadgets
15 hours ago |
4 / 5 (3) |
1
(AP) -- In its search for another technology to excite us, the consumer electronics industry is reaching deep - into the third dimension. The big push for 3-D TV won't happen until next year, but already ...
Santa's Sleigh: Researcher Explains Science Behind St. Nick's Christmas Magic
16 hours ago |
5 / 5 (7) |
3
(PhysOrg.com) -- Santa skeptics have long considered St. Nick’s ability to deliver toys to the world’s good girls and boys in the course of one night a scientific impossibility. But new research shows that ...
Discovery opens new avenues for treating devastating freshwater fish parasite, 'Ich'
20 hours ago |
4.8 / 5 (4) |
0
Researchers from the University of Georgia College of Veterinary Medicine have made an "unexpected" dual discovery that could open new avenues for treating Ichthyophthirius multifiliis, or "Ich", a devastating ...
AT&T to release cellphone with optional projector
Electronics / Consumer & Gadgets
Dec 01, 2009 |
4.3 / 5 (6) |
1
If cellphones with built-in video projectors are going to take the country by storm, then Dallas will be at the eye of the hurricane.
ARS Survey Helps Growers Track Two Key Cotton Pests
Dec 01, 2009 |
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(PhysOrg.com) -- Cotton growers will be better able to keep an eye out for two common pests because of a comprehensive survey by Agricultural Research Service (ARS) scientists at College Station, Texas.
Typhoon Nida's cloud tops dropping as it zigzags in wind shear
Space & Earth / Earth Sciences
Dec 01, 2009 |
3 / 5 (1) |
0
Nida is battling to keep its typhoon strength in the Western Pacific Ocean as wind shear continues to tear at the storm and weaken it. NASA's CloudSat satellite noticed that Nida's cloud tops are not as high ...
Study shows that adults have dreamlike thoughts during sleepwalking and sleep terrors episodes
Dec 01, 2009 |
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A study in the Dec.1 issue of the journal Sleep shows that short, unpleasant, dreamlike mental activity occurs during sleepwalking and sleep terrors episodes, suggesting that people with these sleep disorders may be acting ...
Study shows dream-enacting behavior is common in healthy young adults
Dec 01, 2009 |
4 / 5 (1) |
1
A study in the Dec.1 issue of the journal Sleep shows that dream-enacting behaviors are common in healthy young adults, and the prevalence of specific behaviors differs between men and women.
NASA captures Typhoon Nida's clouds from 2 angles
Space & Earth / Earth Sciences
Nov 30, 2009 |
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NASA satellites capture amazing views of tropical cyclones, and the Aqua and CloudSat satellites captured a top-down look at temperatures in Typhoon Nida's clouds, and an image of what they look like from ...
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