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Encyclopedia > Vitreous humour

Vitreous humour is the clear aqueous solution that fills the space between the lens and the retina of the vertebrate eyeball. The solution is 99% water, but has a gelatinous viscosity two to four times that of water. The remaining solutes include salts, sugars, phagocytes, and a network of collagen fibres. 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. (created with Sodipodi) Schematic diagram of the human eye Aqueous humour Anterior chamber Choroid Cornea Ciliary muscle Iris Lens Optic disc Fovea Optic nerve Posterior chamber Pupil Retina Sclera Suspensory ligament Vitreous humor Zonular fibers File history Legend: (cur) = this is the current file, (del) = delete this old version, (rev... Light from a single point of a distant object and light from a single point of a near object being brought to a focus by changing the curvature of the lens. ... Human eye cross-sectional view. ... Groups Conodonta Hyperoartia Petromyzontidae (lampreys) Pteraspidomorphi (early jawless fish) Thelodonti Anaspida Cephalaspidomorphi (early jawless fish) Galeaspida Pituriaspida Osteostraci Gnathostomata (jawed vertebrates) Placodermi Chondrichthyes (cartilaginous fish) Acanthodii Osteichthyes (bony fish) Actinopterygii (ray-finned fish) Sarcopterygii (lobe-finned fish) Actinistia (coelacanths) Dipnoi (lungfish) Tetrapoda Amphibia Amniota Sauropsida/(Reptiles) Aves (Birds) Synapsida Mammalia... Wikipedia does not yet have an article with this exact name. ... The pitch drop experiment at the University of Queensland. ... A phagocyte is a cell that ingests (and destroys) foreign matter, such as microorganisms or debris via a process known as phagocytosis, in which these cells ingest and kill offending cells by cellular digestion. ... A cell is a single unit or compartment, enclosed by a border or wall. ... Your field of view is that part of the observable world that you are able to see at any given moment. ...

The collagen fibres of the vitreous are held apart by electrical charges. With aging, these charges tend to reduce, and the fibres may clump together. Similarly, the gel may liquify, a condition known as syneresis, leading to cells and other organic clusters to float freely within the vitreous. These commonly lead to floaters, or muscae volitantes (flying flies), which are perceived in the visual field as spots or fiberous strands. Floaters are generally harmless, but the sudden onset of reoccuring floaters may signify a posterior vitreous detachment (PVD) or other diseases of the eye. Collagen triple helix. ... In linguistics, a syneresis is the contraction or slurring of two vowels or syllables (e. ... This article refers to the entoptic phenomenon. ... The vitrous humour fills the eye behind the lens. ...

Sensory system - Visual system - Eye
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

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Spartanburg SC | GoUpstate.com | Spartanburg Herald-Journal (379 words)
The vitreous humour (British spelling) or vitreous humor (U.S. spelling) is the clear gel that fills the space between the lens and the retina of the eyeball of humans and other vertebrates.
The vitreous is also believed to function as a barrier to the forward diffusion of oxygen from the retinal blood supply to the anterior segment of the eye, where it can cause oxidation damage to the lens.
Since the vitreous does not regenerate after being removed from the eye (a procedure known as vitrectomy, which is usually performed to allow surgical access to the posterior segment of the eye), early cataract is a frequent complication of retinal surgery.
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