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Topic: Retina


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Eye

In the News (Thu 18 Apr 19)

  
  Webvision: Simple Anatomy of the Retina
A radial section of a portion of the retina reveals that the ganglion cells (the output neurons of the retina) lie innermost in the retina closest to the lens and front of the eye, and the photosensors (the rods and cones) lie outermost in the retina against the pigment epithelium and choroid.
The second neuropil of the retina, is the inner plexiform layer (IPL), and it functions as a relay station for the vertical-information-carrying nerve cells, the bipolar cells, to connect to ganglion cells.
The latter layer is absent in peripheral retina.
webvision.med.utah.edu /sretina.html   (3357 words)

  
 Vulnerability Assessment | Vulnerability Scanner | Security Assessment | Network Security Scanner
Retina Network Security Scanner, the industry and government standard for multi-platform vulnerability management, identifies known and zero day vulnerabilities plus provides security risk assessment, enabling security best practices, policy enforcement, and regulatory audits.
Retina discovers all connected computers, routers, and other network devices...even those not 'officially' deployed.
Retina helps get a handle on all of your current configurations and patches, regardless of device type.
www.eeye.com /html/Products/Retina/index.html   (181 words)

  
 - Is our 'inverted' retina really 'bad design'? -
I suggest that the need for protection of the retina against the injurious effects of light, particularly with the shorter wavelengths, and of the heat generated by focused light necessitates the inverted configuration of the retina in creatures possessing it.
An image of the external environment is thus focused on the retina which transduces light into neural signals and is the innermost (relative to the geometric centre of the eyeball) of the three tunics of the eye’s posterior segment.
Because of the retina’s inverted arrangement, the axons (nerve fibres) transmitting data to the brain pass under cover of the retina’s inner surface to converge to a small area which is the optic nerve head, where they all exit the eye together as the optic nerve.
www.trueorigin.org /retina.asp   (5078 words)

  
 The Retina of the Human Eye
Photosensitive cells called rods and cones in the retina convert incident light energy into signals that are carried to the brain by the optic nerve.
In the middle of the retina is a small dimple called the fovea or fovea centralis.
The optic nerve is the cable of nerve fibers with carries the electrical signals from the retina to the brain for processing.
hyperphysics.phy-astr.gsu.edu /hbase/vision/retina.html   (548 words)

  
  Retina - Wikipedia, the free encyclopedia
The retina is a thin layer of cells at the back of the eyeball of vertebrates and some cephalopods; it is the part of the eye which converts light into nervous signals.
At the center of the retina is the optic disc, sometimes known as "the blind spot" because it lacks photoreceptors.
The central retina is cone-dominated and the peripheral retina is rod-dominated.
en.wikipedia.org /wiki/Retina   (1961 words)

  
 Retina
Angioid streaks are not a problem; however, the weakened retina is susceptible to the development of new blood vessel growth and scar formation.
A macular hole is a partial or full-thickness hole in the center of the retina or in the macular region.
A blockage of a vein in the retina (branch retinal vein occlusion) is a condition, blood flow in a vein back to the heart in the affected area stops.
www.coopereyecare.com /retina.htm   (3338 words)

  
 Retinal scan - Wikipedia, the free encyclopedia
The human retina is stable from birth to death, making it the most accurate biometric to measure.
This is not the case with a retina scan.
The retina of a deceased person quickly decays and cannot be used to deceive a retinal scan.
en.wikipedia.org /wiki/Retina_scan   (299 words)

  
 Retina Associates of Cleveland, Inc.   (Site not responding. Last check: 2007-11-07)
Separation of the sensory retina from the pigment epithelium, caused by fibrovascular scars that pull and hold the retina.
Dense, ribbon-like firm attachment of vitreous to the surface of the peripheral retina and ora serrata.
Particles that float in the vitreous and cast shadows on the retina; seen as spots, cobwebs, spiders, etc. Occur normally with aging or in association with vitreous detachment, retinal tear, or intraocular inflammation.
www.retina-doctors.com /patient/eyeterms.html   (3320 words)

  
 Retina Summary
The retina is an area at the back of the eye consisting of seven layers of specialized cells and neurons that convert the light signal, which has entered the eye through the cornea and has been focused by the lens, into an electrical signal.
At the center of the retina is the optic disc, sometimes known as "the blind spot" because it lacks photoreceptors.
The central retina is cone-dominated and the peripheral retina is rod-dominated.
www.bookrags.com /Retina   (2785 words)

  
 The Retina
The retina is the innermost layer of the eye (the tunica intima or internal tunic) and is comparable to the film inside of a camera.
The retina is composed of 10 layers, from the outside (nearest the blood vessel enriched choroid) to the inside (nearest the gelatinous vitreous humor):
Beneath the pigmented epithelium of the retina are these 4 layers, from the outside (furthest from the retina) to the inside (closest to the retina):
www.tedmontgomery.com /the_eye/retina.html   (1020 words)

  
 Retina   (Site not responding. Last check: 2007-11-07)
Retina's scheduler function allows you to set the scanner to run on a regular basis to periodically check for vulnerabilities.
Retina is the first and only commercial scanner to license and incorporate the Nmap (Network Mapper) Fingerprint Database, an open-source utility for network exploration and the most complete database of OS TCP/IP stack fingerprints available.
Retina is built with an open architecture that allows you to develop vulnerability tests and auditing modules tailored to your organization's own specific requirements.
www.dbl.co.uk /Retina.asp   (1762 words)

  
 Retina Scanner
Retina's scanning engine is engineered to be faster, less intrusive, and produce better results than all other scanners available.
Retina is the first and only commercial scanner to license and incorporate the Nmap (Network Mapper) Fingerprint Database, an open-source utility for network exploration and the most complete database of OS TCP/IP stack fingerprints available.
Retina is built with an open architecture that allows you to develop vulnerability tests and auditing modules tailored to your organization's own specific requirements.
www.aavextechnology.com /retina.htm   (1158 words)

  
 Retina Center - Ophthalmology in Florida at Ocala Eye
The retina is the part of the eye that translates what you see into information your brain can understand.
This visual information is sent from the retina to the brain via the optic nerve.
Located in the central area of the retina, the macula is considered to be the visual "sweet spot." The macula allows you to focus on someone's face, read a magazine article, or study a picture.
www.ocalaeye.com /html/retina.html   (983 words)

  
 Amazon.com: Retina: Books: Stephen J. Ryan,Thomas E. Ogden   (Site not responding. Last check: 2007-11-07)
Capillary hemangioma of the retina and von Hippel-Lindau disease, 615
Pathogenesis of serous detachment of the retina and pigment epithelium, 971
Endogenous fungal infections of the retina and choroid, 1683
www.amazon.com /exec/obidos/tg/detail/-/0801642418?v=glance   (1154 words)

  
 Eye and Retina
The retina is a seven-layered structure involved in signal transduction.
In the mature retina it is pushed directly up next to the neural retina, which came from the inner layer of the optic cup.
This complex receptive field is created by the interneurons of the retina: the bipolar cells and the horizontal cells, primarily.
thalamus.wustl.edu /course/eyeret.html   (1414 words)

  
 Retina Association of New Zealand: A Family Affair
Retina International is now a large organization that encompasses a range of retinal degenerative conditions with 23 member countries.
Retina New Zealand, its branches and its members are there to support all people affected with retinal degenerative conditions and their families, to pass on information and keep abreast of research developments.
Retina New Zealand is a self-help group that seeks to assist its members to cope with their visual problems.
www.retina.org.nz /resources/Booklets/AFamilyAffair.htm   (4983 words)

  
 Retina
Retina was designed to be the easiest scanner to use.
Retina also features a number of automatic features that facilitate such functions as scheduling, repairing common system problems and updating the application.
Retina is not only the fastest scanner it is also the most comprehensive and accurate.
www.csupomona.edu /~titlev/docs/retina.htm   (436 words)

  
 Retina & Macula Specialists: Eye Care
Occasionally the retina, the inner layer of the eye, is torn when the vitreous gel pulls away.
At Retina and Macula Specialists, we strive to bring you the best laser and surgical retinal care as advances are being made.
It is caused by the growth of abnormal, leaky blood vessels in the eye, beneath the center of the retina.
www.retina-macula.com /eyecare.htm   (1963 words)

  
 Peripheral Retina
The peripheral retina is defined as the zone from the equator to the ora serrata and is approximately three to four disc diameters
Though the retina appears atrophied the condition is more like that of a coloboma or failure of that part of the retina to develop.
This lateral swelling causes the retina to buckle inward at the temporal aspect of the optic nerve head.
www.opt.indiana.edu /riley/HomePage/Peripheral_Retina_Lecture/MSW_Peripheral_Retina.html   (3984 words)

  
 InteliHealth:
The retina is the light-sensitive layer at the back of the eye that converts light images into nerve impulses that are relayed to the brain to produce sight.
When the retina separates from the deeper layers of the eyeball that normally support and nourish it, the retina is said to be detached.
For example, if the retina detaches near the macula, the part of the eye that is responsible for the center of the visual field (reading for instance), then there may be a sudden, significant blurring or loss of vision.
www.intelihealth.com /IH/ihtIH/WSIHW000/9339/9815.html   (1473 words)

  
 Retina
The macula is a small area at the center of the retina in the back of the eye that allows us to see fine details clearly and perform activities such as reading and driving.
RP affects the rods and cones of the retina, the light-sensitive nerve layer at the back of the eye, and results in a decline in vision in both eyes.
The scleral buckle procedure requires the fluid to be drained from under the retina before a flexible piece of silicone is sewn on the outer eye wall to give support to the tear while it heals.
www.missourieye.com /services/retina.html   (4065 words)

  
 Retina   (Site not responding. Last check: 2007-11-07)
Retina is recognised as the best network security scanner on the market in terms of speed, ease of use, non-intrusiveness and advanced scanning capabilities using A1 technology.
Retina can scan every machine on your network, including a variety of operating systems, networked devices and third-party or custom applications, all in record time.
Because eEye is also a leading digital security research entity, Retina incorporates the most comprehensive and up-to-date vulnerabilities database.
www.systemhouse.com /eEye/retina.htm   (116 words)

  
 Detached Retina (Retinal Detachment): Definition, Symptoms, and Treatment - Kellogg Eye Center
A retinal detachment occurs when the retina is pulled away from its normal position in the back of the eye.
The retina normally lies smoothly and firmly against the inside back wall of the eyeball and functions much like the film in the back of a camera.
The retina specialists at the Kellogg Eye Center have particular expertise in the treatment of retinal detachments.
www.kellogg.umich.edu /patientcare/conditions/detached.retina.html   (935 words)

  
 Retinal Detachment Resource Guide [NEI Health Information]
The retina is the light-sensitive layer of tissue that lines the inside of the eye and sends visual messages through the optic nerve to the brain.
Gas is often injected to into the eye to replace the vitreous and reattach the retina; the gas pushes the retina back against the wall of the eye.
Retinal detachment, separation of the neurosensory retina from the underlying retinal pigment epithelium, is a sight threatening condition that is considered one of the few ocular emergencies.
www.nei.nih.gov /health/retinaldetach/index.asp   (1384 words)

  
 Retina Associates of Florida
Retina's Lucentis patients celebrate the success of their treatments at a special luncheon.
Retina Associates of Florida is the only retina practice in Tampa to use Ultrasonic Biomicroscope (UBM) for the treatment of hypotony (low pressure) in the eye.
Retina Associates is participating in clinical trials studying new treatments for various retinal and macular diseases.
www.retinaassociatesfla.com /index.html   (264 words)

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