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Topic: Aqueous humour


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Eye

  
 Vitreous humour - Wikipedia, the free encyclopedia
Vitreous humour is the clear aqueous solution that fills the space between the lens and the retina of the vertebrate eyeball.
The phagocytic cells are present to remove unwanted debris in the visual field.
The primary purpose of the vitreous humour is to provide a cushioned support for the rest of the eye, as well as a clear unobstructed path for light to travel to the retina.
en.wikipedia.org /wiki/Vitreous_humour   (255 words)

  
 Ophthalmology Department, University of the Witwaterand, Edu   (Site not responding. Last check: 2007-10-22)
Because pressure is distributed evenly throughout the eye, the pressure is generally the same in the posterior vitreous as it is in the aqueous humour, despite the fact that the pressure level is generated in the anterior segment.
Aqueous moves unaltered, through the face of the ciliary body, to be absorbed by vessels or to break through the scleral wall into surrounding periocular orbital tissues.
Aqueous flow from the ciliary processes into the posterior chamber is due to two separate processes: ultrafiltration and metabolic pumping.
www.wits.ac.za /fac/med/ophthalmology/opjan99.htm   (2096 words)

  
 Aqueous - findnice.net   (Site not responding. Last check: 2007-10-22)
aqueous humour watery, alkaline liquid that occupies the anterior and posterior chambers of the eye—the space in front of the iris and lens and the ringlike
The aqueous is the thin, watery fluid that fills the space between the cornea and the iris (anterior chamber).
The aqueous humour is the clear, watery fluid that fills the complex In health the aqueous humour does not mix with the firm, gel-like vitreous humour.
findnice.net /?q=aqueous   (946 words)

  
 FAHERS 321   (Site not responding. Last check: 2007-10-22)
Aqueous humour passes from the anterior chamber through the intertrabecular and intratrabecular spaces which are lined by trabecular cells.
These two properties of aqueous humour together with the fact that it is transparent are necessary for the normal functioning of the eye.
Aqueous humour (AqH) is a clear, colourless fluid actively secreted by the ciliary processes.
www.lab.anhb.uwa.edu.au /vsci/Aqueous.htm   (1348 words)

  
 ipedia.com: Aqueous humour Article   (Site not responding. Last check: 2007-10-22)
The aqueous humour is the clear, watery fluid in the eye that fills the space between the lens and the cornea.
While the vitreous humour behind the lens is normally gel-like and does not flow, the aqueous humour flows from the posterior chamber to the anterior chamber of the eye past the iris.
This is because it is produced by the ciliary body in the posterior chamber and drained by the trabecular meshwork in the anterior chamber.
www.ipedia.com /aqueous_humour.html   (237 words)

  
 The aqueous humour (from human eye) --¬† Encyclop√¶dia Britannica
The aqueous humour is a clear colourless fluid with a chemical composition rather similar to that of blood plasma (the blood exclusive of its cells) but lacking the high protein content of the latter.
Aqueous humour is formed from the blood by filtration...
In the ancient physiological theory still current in the European Middle Ages and later, the four cardinal humours were blood, phlegm, choler (yellow bile), and melancholy (fl bile); the...
www.britannica.com /eb/article-64879?tocId=64879   (792 words)

  
 COS - Welcome to the Canadian Journal of Ophthalmology
We evaluated the levels of enzymatic and nonenzymatic antioxidants in blood and aqueous humour of cataractous poodles in comparison to noncataractous poodles.
We evaluated ascorbic acid levels in plasma of all animals and in aqueous humour of cataractous poodles and mixed-breed dogs.
Aqueous humour samples were obtained just before the anterior chamber was opened.
www.eyesite.ca /english/program-and-services/cjo/vol39/no1/abs1.htm   (352 words)

  
 The correlation coefficient between the glucose content of the aqueous humour of the eye and that of capillary blood is ...
To determine changes of the correlation between the content of glucose in aqueous humour and in the plasma of capillary blood depending on the underlying illness.
Capillary blood and aqueous humor were sampled from 36 fasting patients with diabetes mellitus (type I or II) and from 64 non diabetics scheduled for cataract surgery (CS) or pars plana vitrectomy (PPV) to measure glucose concentrations (hexokinase-method).
The coefficient of correlation (r) between glucose content of aqueous humour (aq) and capillary blood (pl) was calculated.
www.dog.org /2000/e-abstract_2000/87.html   (269 words)

  
 Glaucoma (Primary Open Angle) - Patient UK
Aqueous humour is made by cells that line the ciliary body.
The aqueous humour drains out from the eye into the bloodstream through the sieve-like trabecular meshwork.
Another technique is to destroy parts of the ciliary body which reduces the amount of aqueous humour that is made.
www.patient.co.uk /showdoc.asp?doc=23068745   (1369 words)

  
 British Journal of Pharmacology - Abstract of article: Atriopeptin, sodium azide and cyclic GMP reduce secretion of ...   (Site not responding. Last check: 2007-10-22)
This study examined the involvement of cyclic GMP, protein kinase G and intracellular Ca movements in the modulation of aqueous humour formation.
Using the bovine arterially-perfused eye preparation, drug effects on intraocular pressure and aqueous humour formation rate were measured by manometry and fluorescein dilution, respectively.
Aqueous humour formation in the bovine eye can be manipulated through cyclic GMP, operating via protein kinase G. Close parallels appear when Ca movements are modified by similar manipulations of cyclic GMP, suggesting that Ca transients may play an important role in aqueous humour formation and that interplay occurs between cyclic GMP and Ca Keywords:
www.nature.com /bjp/journal/v127/n6/abs/0702681a.html   (427 words)

  
 Introduction to the Eye   (Site not responding. Last check: 2007-10-22)
It is primarily involved with the formation of aqueous humour and in adjusting the eye to the vision of near objects (accommodation).
The optical or refracting media may be divided into: the aqueous humour; the vitreous body; and the crystalline lens.
Little more than water (with some small amounts of Na and Cl), aqueous humour fills the anterior chamber (bounded by the back of the cornea and the front of the iris) and the posterior chamber (bounded by the back of the iris, the ciliary body and the lens) of the eye.
www.lx040-001.gsbme.unsw.edu.au /~greggs/eye_web/anatomy.html   (905 words)

  
 Method for the surgical treatment of the eye - Patent 4391275   (Site not responding. Last check: 2007-10-22)
The zone of localized resistance to the free circulation of the aqueous humour is in this case situated on a level with the inner wall of the canal of Schlemm, the so-called trabecular meshwork, which separates the canal of Schlemm from the anterior chamber of the eye nearby the irido-corneal angle.
Any method, in which the perforation of another region of the eyeball, allowing the re-establishment of the free circulation of the aqueous humour, is carried out in conditions like radiation and focussing of a laser beam does not depart from the scope of the present invention.
Another important case of glaucoma to be treated of a certainty appears to be glaucoma related to an inflammation of the supraciliary space and of the iris, such an inflammation leading to the sticking of the iris-root on the walls of the angle of the anterior chamber of the eye.
www.freepatentsonline.com /4391275.html   (4919 words)

  
 Laser refractive surgery   (Site not responding. Last check: 2007-10-22)
Fluid-filled (aqueous humour) space inside the eye between the iris and the cornea.
In this case, the diminution of the aqueous humor flow is responsible for high pressure in the eye, not the closing of the iridocorneal angle.
Type of glaucoma caused by a high intraocular pressure due to the progressive obstruction of the filter (trabecular meshwork) where aqueous humour is drained.
www.chirurgivision.com /en/faq.asp?lexique=all   (4788 words)

  
 Nyogel
Aqueous humour is produced by a part of the eye called the ciliary body, and it drains out of the eyeball through channels called the trabecular meshwork.
If the outflow of aqueous humour is blocked, the aqueous humour builds up inside the eye, increasing the pressure within the eyeball.
Timolol therefore reduces the inflow of aqueous humour into the eyeball, which decreases the pressure within the eye.
www.netdoctor.co.uk /medicines/100004688.html   (1244 words)

  
 Aniridia Network - Aniridic Glaucoma   (Site not responding. Last check: 2007-10-22)
if this is the case the aqueous humour cannot drain away in sufficiently and the eye pressure increases.
In older children and adults with aniridia, the tiny part of the iris that is present in the aniridic eye (but not visable to other people) covers the trabecular meshwork preventing the aqueous humour from draining away and again eye pressure increases.
The vitreous humour may be distrubed and if this happens a vitreous detachment may cause flashes and floaters, and in some cases it may lead to a retinal detachment.
www.aniridia.org /conditions/glaucoma.html   (787 words)

  
 Aqueous humour - Wikipedia, the free encyclopedia
Glaucoma is a condition characterised by increased intraocular pressure (pressure within the eye), usually caused by increased resistance to outflow of aqueous humour through an abnormal trabecular meshwork, or to obliteration of the meshwork caused by injury or disease of the iris.
Uncontrolled glaucoma will lead to visual field loss and ultimately blindness.
Optic disc - Retina - Cornea - Iris - Pupil - Lens - Macula - Sclera - Optic fovea - Blind spot - Vitreous humour - Aqueous humour - Choroid - Ciliary body - Conjunctiva - Angle structure - Tapetum lucidum
en.wikipedia.org /wiki/Aqueous_humour   (241 words)

  
 (Print Version) Glaucoma
Aqueous humour and serum zinc and copper concentrations of patients with glaucoma and cataract
Serum and aqueous humour zinc and copper concentrations of 44 patients with glaucoma and cataract were determined.
In addition there was a significant negative correlation between the aqueous humour levels of zinc and copper in patients with glaucoma.
www.lef.org /protocols/abstracts/abstr-txt/t-abstr-053.html   (3073 words)

  
 Aqueous humour -- Facts, Info, and Encyclopedia article   (Site not responding. Last check: 2007-10-22)
Aqueous humour -- Facts, Info, and Encyclopedia article
The aqueous humour allows nutrients to circulate to the (Click link for more info and facts about corneal endothelium) corneal endothelium and its pressure maintains the convex shape of the cornea.
Uncontrolled glaucoma will lead to visual field loss and ultimately (Lack of sight) blindness.
www.absoluteastronomy.com /encyclopedia/A/Aq/Aqueous_humour.htm   (67 words)

  
 8-Isoprostaglandin F2a and ascorbic acid concentration in the aqueous humour of patients with exfoliation syndrome -- ...
Increased growth factor activity in the aqueous humour of patients with exfoliation syndrome.
Transforming and insulin-like growth factors in the aqueous humour of patients with exfoliation syndrome.
Endothelin-1 concentration is increased in the aqueous humour of patients with exfoliation syndrome
bjo.bmjjournals.com /cgi/content/full/87/3/353   (2925 words)

  
 Polymerase chain reaction analysis of aqueous humour samples in necrotising retinitis -- Tran et al. 87 (1): 79 -- ...
Aqueous humour was obtained after anterior chamber paracentesis
Detection of herpesvirus DNA in vitreous and aqueous specimens by the polymerase chain reaction.
Serological and polymerase chain reaction-based analysis of aqueous humour samples in patients with AIDS and necrotizing retinitis.
bjo.bmjjournals.com /cgi/content/full/87/1/79   (2710 words)

  
 Glaucoma   (Site not responding. Last check: 2007-10-22)
One factor may be a relative obstruction on the outflow of aqueous humour from the eye.
Aqueous humour is produced by the ciliary body of the eye, and then flows through the pupil and into the anterior chamber.
The trabecular meshwork then drains the humour to Schlemm's canal, and ultimately to the venous system.
www.worldhistory.com /wiki/G/Glaucoma.htm   (1409 words)

  
 IMMEDIATE INCREASE OF AQUEOUS HUMOUR ENDOTHELIN-1 CONCENTRATION AFTER ARGON LASER TRABECULOPLASTY IS ASSOCIATED WITH ...   (Site not responding. Last check: 2007-10-22)
Post-laser IOP measurements followed by aqueous humour aspiration were performed under general anaesthesia 30 minutes and 1, 4, 24 and 120 hours after treatment.
During the first hour aqueous humour ET-1 concentration was significantly higher (55.0 pg/ml) after ALT than in the contralateral eyes without laser treatment (8.2 pg/ml, p=0.001), and IOP increased significantly after ALT (p=0.007) but remained unaltered (p=0.10) in the contralateral eyes without treatment.
The results suggest that in the rabbit ALT is immediately followed by a significant increase of aqueous humour ET-1 concentration.
www.dog.org /1999/abstract99/17.html   (332 words)

  
 Physics Help and Math Help - Physics Forums - Is my line of reasoning flawed?
The reason I assert that the image formed is upright is because the aqueous humour-air interface (which is responsible for the refraction which causes the image to be inverted in most cases) is replaced with an aqueous humour-water interface.
Water and the aqueous humour both have a refractive index of approx.
Because the refraction occuring between the two mediums (water and the aqueous humour) in this instance is effectively negligible, rays which are parallel at the cornea can be considered to be still parallel at the lens, as demonstrated in the attached picture.
www.physicsforums.com /printthread.php?t=16249   (2307 words)

  
 The Eye
Behind the cornea is the iris - the coloured part of the eye - with the pupil forming a hole in its centre.
The space between the cornea and the iris is filled with a clear fluid, called 'aqueous humour', which maintains the pressure in the eye (the intraocular pressure).
Describes the flow os aqueous humour in the eye and both conventional (trabecular) and unconventional (uveoscleral) outflow.
www.glaucoma-association.com /nqcontent.cfm?a_id=244   (144 words)

  
 Xalacom eye drops   (Site not responding. Last check: 2007-10-22)
Blocking the beta receptors in the eye reduces the amount of aqueous humour that is produced.
Timolol therefore reduces the inflow of aqueous humour into the eyeball and so decreases the pressure within the eyeball.
These two medicines are combined as one eye drop to lower the pressure in the eye when a beta-blocker eye drop alone does not lower the pressure within the eye enough.
www.netdoctor.co.uk /medicines/100004657.html   (1188 words)

  
 DanioLabs - Glaucoma
Normally, fluid (aqueous humour) is produced in the rear chamber of the eye, flows through the pupil to the front chamber, where it drains out through the “canals of Schlemm”.
The aqueous humour provides oxygenation, nutrition and structural support to the eye.
Meiotics, such as pilocarpine, constrict the pupil, with the consequence that the flow of aqueous humour out of the eye is increased.
home.btconnect.com /DanioLabs/thera_3ophthalmology_2glaucoma.html   (297 words)

  
 Medicines - glaucoma   (Site not responding. Last check: 2007-10-22)
This is caused by an imbalance between the formation of the liquid substance (aqueous humour) in the eye and its absorption, or drainage, out of the eye.
Sympathomimetics seem to work by reducing the amount of aqueous humour in the eye, and by increasing drainage of this fluid from the eye.
Beta-blockers probably work by reducing the rate at which aqueous humour is produced.
www.bupa.co.uk /health_information/html/medicine/glaucoma.html   (948 words)

  
 Penetration of cefpirome into the anterior chamber of the human eye after intravenous application -- Egger et al. 45 ...
Aqueous humour concentrations of cefpirome after iv administration.
is not reflected in the aqueous humour concentrations.
of 6 h was not detectable in aqueous humour or serum samples.
jac.oxfordjournals.org /cgi/content/full/45/2/213   (1579 words)

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