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
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 ...
Study finds many people with hemianopia have difficulty detecting pedestrians while driving
Nov 12, 2009 |
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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 |
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(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 |
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(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 |
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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 |
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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 ...
Scientists obtain clearer view of how eye lens proteins are sorted
Nov 03, 2009 |
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New research reveals how proteins that are critical for the transparency of the eye lens are properly sorted and localized in membrane bilayers. The study, published by Cell Press in the November 3rd issue of Biophysical Jo ...
Two Retinal Imaging Display Devices at Prototype Stage
Electronics / Consumer & Gadgets
Oct 30, 2009 |
4.9 / 5 (28) |
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(PhysOrg.com) -- NEC and Brother are both developing wearable prototype devices that use Retinal Imaging Display (RID) technology to project images directly on the wearer's retina. NEC's gadget is designed ...
Like mother, like daughter, at least around the eyes
Oct 28, 2009 |
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(PhysOrg.com) -- New research suggests the old saying commonly told to husbands-to-be is true, that if you want to know what your wife will look like, look at her mother.
No such thing as a break in a curveball?
Medicine & Health / Neuroscience
Oct 27, 2009 |
4.3 / 5 (3) |
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The answer to the question of whose curveball breaks harder -- that of the Yankees' A.J. Burnett or the Phillies' Cole Hamels -- may be neither.
AMD drug and IOP; getting good eyeglasses to those in need
Oct 26, 2009 |
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A first-time finding of intraocular pressure increases in patients with no personal or family history of glaucoma following anti-VEGF treatment for wet age-related macular degeneration (AMD), and a report on a simple, low-cost ...
Reprogramming a patient's eye cells may herald new treatments against degenerative disease
Oct 22, 2009 |
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Scientists have overcome a key barrier to the clinical use of stem cells with a technique which transforms regular body cells into artificial stem cells without the need for introducing foreign genetic materials, which could ...
First in New York: Bionic technology aims to give sight to woman blinded beginning at age 13
Oct 21, 2009 |
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A 50-year-old New York woman who was diagnosed with a progressive blinding disease at age 13 was implanted with an experimental electronic eye implant that has partially restored her vision. A team led by Dr. Lucian V. Del ...
Watching me, watching you
Oct 21, 2009 |
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(PhysOrg.com) -- Software that tracks shoppers' eye movements as they browse supermarket shelves may seem a bit Big Brother, but the latest technology in 'eye-tracking', which monitors what grabs a person's ...
Experimental treatments restore partial vision to blind people
Medicine & Health / Neuroscience
Oct 20, 2009 |
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Two experimental treatments, a retinal prosthesis and fetal tissue transplant, restored some vision to people with blinding eye diseases. The findings, presented at Neuroscience 2009, the annual meeting of the Society for ...
