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) |
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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 (7) |
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.
Can heart disease treatments combat AMD?
11 minutes ago |
not rated yet |
0
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 |
4 / 5 (1) |
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.
