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Topic: Vitreous

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	Vitreous - eye anatomy
		The vitreous is a thick, transparent substance that fills the center of the eye.
		The vitreous is firmly attached to certain areas of the retina.
		As the vitreous thins, it separates from the retina, often causing floaters.
	www.stlukeseye.com /anatomy/Vitreous.asp (106 words)

	eMedicine - Hemorrhage, Vitreous : Article by Brian A Phillpotts, MD (Site not responding. Last check: 2007-10-26)
		The vitreous body is bounded posterolaterally by the internal limiting membrane of the retina, anterolaterally by the nonpigmented epithelium of the ciliary body, and anteriorly by the lens zonular fibers and posterior lens capsule.
		The vitreous hemorrhage-induced glaucoma is secondary to the blockade of the trabecular meshwork by formed ghost cells due to long-standing blood cells in the vitreous.
		Similarly, vitreous hemorrhage within the space between the internal limiting and the nerve fiber layer may resemble that within the retrohyaloid space, except that the blood does not shift with change in the head position as may be the case with subhyaloid hemorrhage.
	www.emedicine.com /oph/topic421.htm (3374 words)

	Retina Group: Retinal Detachment and Vitreous Surgery (Site not responding. Last check: 2007-10-26)
		The vitreous is removed and, therefore, this procedure is called "vitrectomy." The surgeon uses a fiberoptic light to illuminate the inside of the eye and other instruments inside the eye, such as foreceps, and scissors, to do the surgery.
		The vitreous is replaced during the operation with either clear fluid that is compatible with the eye, or with air that completely fills the eye.
		Removing the vitreous and especially the scar tissue from the surface of the retina is a delicate process that requires the surgeon to lift and peel strands of scar tissue away from the retina.
	www.retinagrouppc.com /doc2.htm (5334 words)

	Facts About Vitreous Detachment [NEI Health Information]
		As the vitreous shrinks, it becomes somewhat stringy, and the strands can cast tiny shadows on the retina that you may notice as floaters, which appear as little "cobwebs" or specks that seem to float about in your field of vision.
		Those who have a vitreous detachment in one eye are likely to have one in the other, although it may not happen until years later.
		Although a vitreous detachment does not threaten sight, once in a while some of the vitreous fibers pull so hard on the retina that they create a macular hole or lead to a retinal detachment.
	www.nei.nih.gov /health/vitreous/index.asp (440 words)

	The Vitreous Humor
		The vitreous humor is a clear gel which occupies the posterior compartment of the eye, located between the crystalline lens and the retina and occupying about 80% of the volume of the eyeball.
		The flashes of light occur as the vitreous tugs on the sensory layer of the retina as the vitreous is detaching.
		As a posterior vitreous detachment (PVD) occurs—that is, as the vitreous fluid separates from the retina—organic debris or particles known as “floaters” are released.
	www.tedmontgomery.com /the_eye/vitreous.html (854 words)

	Postgraduate Medicine: Posterior vitreous detachment
		Vitreous traction on the retina is a common stimulus for flashing lights (eg, retinal phosphenes, photopsias), which, depending on definition, can be considered either an entoptic image or a visual hallucination.
		The vitreous is adherent to the ora serrata anteriorly and to the optic nerve head and macula posteriorly.
		When a vitreous opacity is anterior to the axis of ocular rotation, movement of the entoptic image is in the opposite direction of gaze; when the opacity is behind the axis, movement of the entoptic image is in the same direction of gaze.
	www.postgradmed.com /issues/2005/03_05/margo.htm (2421 words)

	Flashes and Floaters (Site not responding. Last check: 2007-10-26)
		So when the retinal photoreceptors experience mechanical stimulation because of the vitreous pull, they send a signal to the brain in the form of disorganized light, which is perceived by the brain as a 'flash'.
		Posterior vitreous detachment occurs in less that 10% people under 50 years of age but in more than 60% people who are over 70 years of age.
		The key to their differentiation from vitreous floaters is the observation of excessive movement or even disappearance of tear film debris floaters with blinking only - without eye movement.
	www.agingeye.net /visionbasics/flashesandfloaters.php (1700 words)

	Eye Conditions > Vitreous Hemorrhage -- EyeMDLink.com
		Vitreous hemorrhage is a condition of intraocular (inside the eye) bleeding that usually presents with sudden vision loss, frequently with complaints of floaters or "spots" in the vision.
		The condition is not due to bleeding of the vitreous humor, but rather bleeding from the retinal vessels or underlying choroid (layer of capillaries beneath the retina) in most cases.
		Posterior vitreous separation (separation of the vitreous humor from the retina), common in the middle-aged and elderly, occasionally produces a torn retinal vessel, and therefore a vitreous hemorrhage.
	www.eyemdlink.com /Condition.asp?ConditionID=506 (246 words)

	Vitrectomy - Practice Procedures - Retina Vitreous Center PA - Ophthalmology - Retinal and Vitreous Specialists - ...
		Detaching the vitreous gel from the retinal surface is an important part of macular hole surgery.
		A macular pucker is caused by a thin membrane of scar-like tissue on the surface of the retina.
		After the vitreous gel is removed from the eye, small instruments are use to gently peel this tissue and remove it from the eye.
	www.retinavitreouscenter.com /ret-procedures_vitrectomy1.htm (1645 words)

	ATSDR - ToxFAQs™: Synthetic Vitreous Fibers (Site not responding. Last check: 2007-10-26)
		Synthetic vitreous fibers are a group of fibrous, inorganic materials that contain aluminum or calcium silicates, and are made from rock or stone, clay, slag, or glass.
		Synthetic vitreous fibers are generally not broken down in the environment.
		When synthetic vitreous fibers are suspended in air they can cause irritation of the eyes, the nose and throat, and parts of the lung.
	www.atsdr.cdc.gov /tfacts161.html (1247 words)

	Ocular Pathology Study Guide: VITREOUS (Site not responding. Last check: 2007-10-26)
		The vitreous cavity is simply an expanded extracellular space that normally contains 4.0 ml of clear gelatinous substance that is composed largely of water, hyaluronic acid, and collagen.
		The serrated border of the retina is the ora serrata.
		Traction exerted by the vitreous body at the base results in hyperpigmentation of the underlying pigment epithelium and is evident grossly.
	www.medrounds.org /ocular-pathology-study-guide/2005/10/vitreous.html (370 words)

	ATSDR - Public Health Statement: Synthetic Vitreous Fibers (Site not responding. Last check: 2007-10-26)
		Synthetic vitreous fibers are a group of fibrous inorganic materials that contain aluminum or calcium silicates and other trace oxides and metals, and are made from rock, slag, clay, or glass.
		If you swallow synthetic vitreous fibers (by eating, drinking, or by swallowing fibers that have moved from nasal or lung airways to your larynx), nearly all of the fibers pass through your intestines within a few days and are excreted in the feces.
		Because synthetic vitreous fibers are not absorbed into the body (when inhaled or ingested), it is unlikely that they would cause birth defects or be transferred in breast milk to nursing infants.
	www.atsdr.cdc.gov /toxprofiles/phs161.html (3683 words)

	Vitreous - Wikipedia, the free encyclopedia
		Vitreous refers to a material in an amorphous, glassy state (in contrast to a crystalline state).
		The creation of a vitreous material by supercooling or by addition of additives prior to cooling is called vitrification.
		Toilets are made of vitreous china, one of the few materials able to withstand the harsh (caustic) chemicals used to clean them.
	en.wikipedia.org /wiki/Vitreous (157 words)

	Retinal and Vitreous Surgery
		If you see someone off to your side ('out of the corner of your eye'), you might be able to tell who it is because you recognize the person's general shape, but you won't be able to see the expression on the person's face.
		The vitreous is much like the clear 'white' of an egg and it fills the central cavity of the eye.
		Little by little, the liquid from the vitreous passes through the retinal tear and settles under the retina, separating it from the back wall of the eye.
	www.alconlabs.com /ca_en/eo/surgery/vitret.jhtml (620 words)

	Vitreous Hemorrhage
		The vitreous is the clear gel that fills the inside of the eyeball.
		During vitrectomy, fine instruments are placed inside the eye to remove the vitreous gel and hemorrhage and replace it with a sterile saline solution.
		This procedure allows a rapid visual recovery in most cases and is often accompanied by laser treatment or other procedures to treat the cause of the hemorrhage and reduce the likelihood of recurrence.
	www.focusonretina.com /vit_hem.htm (369 words)

	ISTA :: Products :: Vitrase for Vitreous Hemorrhage & Diabetic Retinopathy
		The immediate consequence of a vitreous hemorrhage is a reduction in the amount of light that can pass through the normally clear vitreous humor to the retina.
		Depending on the severity of the vitreous hemorrhage, it may take several months or significantly longer for the body to reabsorb the blood and for the patient to regain vision.
		NDA for the treatment of vitreous hemorrhage and for use as a spreading agent, the successful completion of any additional clinical trials for the diabetic retinopathy indication and the continuing assessment of the market opportunity for this indication as compared to other product opportunities we may be pursuing at the time.
	www.istavision.com /research/products_vitrase.asp (987 words)

	Vitreous Degeneration (Site not responding. Last check: 2007-10-26)
		Vitreous degeneration may be one of several conditions: It may refer to liquification of the vitreous which occurs following some types of inflammation.
		Vitreous degeneration may be significant because it has been suggested that it may predispose patients to retinal detachment.
		For this reason, patients found to have vitreous degeneration should be monitored for possible retinal detachment by the use of ultrasonography and careful examination of the retina at regular intervals.
	www.animal-eye-specialists.com /vitreous.htm (354 words)

	Vitreous Enamellers - A.J Wells & Sons Ltd
		We are the leading British manufacturer specialising in vitreous enamel signage and graphics, sheet steel and cast iron and architectural panels.
		The unrivalled properties of vitreous enamel make it the best application available for products diverse as commercial signage to domestic range cookers.
		Our dedicated and highly skilled workforce is complemented by the very latest in enamel technology – including our own milling, spraying, printing and furnacing.
	www.ajwells.com (213 words)

	tulsaworld.com: Health Scene
		Vitreous floaters are small, fl spots that swim in and out of vision.
		The signs and symptoms of vitreous floaters include fl spots or “spider webs” that seem to float in the vision in a cluster or alone, spots that move or remain suspended in one place, and flickering or flashing lights that are most prominent when looking at a bright background like a clear, blue sky.
		Surgical removal of the vitreous, called vitrectomy, might be considered necessary only if the cells and debris are extremely dense and interfere with useful vision, but this is very rare.
	www.tulsaworld.com /healthresource.asp?id=030731_He_EYEVitreous (448 words)

	eMedicine - Vitreous Hemorrhage : Article by Gregory Luke Larkin, MD, MSPH, MSEng, FACEP (Site not responding. Last check: 2007-10-26)
		Vitreous is 99% water, with collagen and hyaluronic acid comprising the remaining 1%.
		Vitreous hemorrhage is defined as the presence of extravasated blood within the space outlined by the zonular fibers and posterior lens capsule anteriorly, the nonpigmented epithelium of the ciliary body laterally, and the internal limiting membrane of the retina (lamina limitans interna) posteriorly and posterolaterally.
		Since healthy vitreous is relatively inelastic and impervious to cells and debris, it plays an essential role in maintaining the transparency and form of the eye.
	www.emedicine.com /emerg/topic789.htm (2345 words)

	Vitreous haemorrhage and other problems
		A vitreous haemorrhage is the term given to bleeding into the middle chamber of the eye (the 'vitreous').
		If there is a smaller vitreous haemorrhage it may settle behind the vitreous gel and in front of the retina.
		The vitreous shrinkage (green) pulls on the central area of the retina (the macula) and affects the vision.
	medweb.bham.ac.uk /easdec/vitreous_hemorrhage.html (1052 words)

	Vitreous
		These tiles are high quality vitreous glass tiles mounted on mesh backing.
		These are Amethyst color high quality vitreous glass 3/4" square individual tiles mounted on mesh.
		These are Apricot color high quality vitreous glass 3/4" square individual tiles mounted on mesh.
	www.mosaic-tile.com /vitreous.htm (1373 words)

	Vitreous detachment (Site not responding. Last check: 2007-10-26)
		The vitreous space is located posteriorly between the lens of the eye and the retina.
		It is filled with a material called vitreous which is similar to clear Jell-O. As we age, the normal jelly-like consistency of the vitreous begins to liquefy.
		The vitreous may contract and pull away from its natural attachments on the inside surface of the eye.
	www.theretinasource.com /conditions/vitreous_detachment.htm (326 words)

	Posterior vitreous detachment
		Many retinal detachments are associated with posterior vitreous detachment (PVD), a common condition in which the vitreous gel shrinks and separates from the retina.
		Posterior vitreous detachment usually results from normal, age-related changes in the vitreous gel, although it can also result from eye injury or inflammation caused by surgery or disease.
		At points where the vitreous gel is strongly attached to the retina, the gel can pull so hard on the retina—a process called traction—that it tears the retina.
	www.webmd.com /hw/health_guide_atoz/hw187090.asp (286 words)

	Retina & Vitreous Services (Site not responding. Last check: 2007-10-26)
		TTogether, the retina and vitreous bring the tiniest detail into focus - the seeds of a flower, the handwriting of a loved one, the brilliant colors of a painting.
		As the population ages, the number of Americans with retinal and vitreous disorders and vision loss is steadily increasing.
		Our highly-trained specialists are devoted to the care of the retina and the vitreous, the "back of the eye" components essential to clear vision.
	www.muschealth.com /eyes/services/retina.htm (356 words)

	Floaters - Posterior Vitreous Detachment (Site not responding. Last check: 2007-10-26)
		The space between the crystalline lens and the retina is filled with a clear, gel-like substance called vitreous.
		As the vitreous pulls free from the retina, it is often accompanied by light flashes or floaters.
		Floaters are caused by tiny bits of vitreous gel or cells that cast shadows on the retina.
	www.theretinasource.com /conditions/floaters.htm (536 words)

	VisionSimulator.com — Vitreous Hemorrhage
		A vitreous hemorrhage, or bleed, is when blood vessels grow in the gel that fills the eye and then burst.
		If you have any of the signs of a vitreous hemorrhage, seek the help of an eye doctor right away.
		Sometimes treatment is not needed for vitreous hemorrhages.
	www.visionsimulator.com /dvh.asp (268 words)

	Clinical Trial: Intravitreal Long Acting Gas in the Prevention of Early Postoperative Vitreous Hemorrhage in Diabetic ...
		While evidence suggests fibrovascular proliferation from the sclerotomy sites or in the vitreous base may be an important source of recurrent vitreous hemorrhage, other origins of hemorrhage exist including lysed clot from residual vitreous skirt, injured retinal vessels from surgery, and incompletely removed fibrovascular tissues.
		We hypothesize that gas bubble within the vitreous cavity may mechanically temponade the fragile retinal vessels, and concentrate the coagulation factors in the vitreous cavity, allowing the integrity of vessel walls gradually recovers and thus preventing the occurrence of early postoperative recurrent vitreous hemorrhage.
		To test this hypothesis, a clinical study was undertaken to investigate the effect of long-acting gas infused into the vitreous cavity at the end of diabetic vitrectomy in the prevention of recurrent vitreous hemorrhage.
	www.clinicaltrials.gov /ct/show/NCT00155454 (852 words)

	ISTA :: Conditions :: Vitreous Hemorrhage
		A vitreous hemorrhage occurs when retinal blood vessels rupture and bleed into the vitreous humor.
		Based on data compiled by Business Genetics, we commissioned in February 1999, we believe that approximately 450,000 cases of vitreous hemorrhage occur each year in the United States, a total of 400,000 cases occur each year in the five largest European markets and 190,000 cases occur each year in Japan.
		, if approved for the vitreous hemorrhage indication, is unlikely to be used in all cases of vitreous hemorrhage.
	www.istavision.com /conditions/conditions_vitreous.asp (557 words)

	Symptoms of Vitreous detachment - WrongDiagnosis.com
		Note that Vitreous detachment symptoms usually refers to various symptoms known to a patient, but the phrase Vitreous detachment signs may refer to those signs only noticable by a doctor:
		This signs and symptoms information for Vitreous detachment has been gathered from various sources, may not be fully accurate, and may not be the full list of Vitreous detachment signs or Vitreous detachment symptoms.
		Furthermore, signs and symptoms of Vitreous detachment may vary on an individual basis for each patient.
	www.wrongdiagnosis.com /v/vitreous_detachment/symptoms.htm (445 words)

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