ring(redirected from mitral ring)
Also found in: Dictionary, Thesaurus, Financial, Encyclopedia.
Types RING-HC, RING-H2
RING is an acronym for Really Interesting New Gene
Synonym(s): anulus [TA] .
anterior limiting ring of Schwalbe A bundle of connective tissue and elastic fibres forming the junction between the anterior termination of the trabecular meshwork and Descemet's membrane of the cornea. If it is unusually thickened or prominent, it is called posterior embryotoxon. Syn. line of Schwalbe. See direct gonioscopy; Axenfeld's syndrome; Rieger's syndrome.
Coat's white ring A small, oval or circular, whitish-grey ring opacity in the cornea found at the level of Bowman's layer, usually near the periphery. It is composed of a deposition of iron, possibly located at the site of a previous foreign body injury. No treatment is necessary. See iron line.
Fleischer's ring A narrow ring of brownish or greenish pigment containing iron, deposited in the epithelium of the cornea and surrounding (completely or partially) the base of the cone in keratoconus. It is not always present in that disease. Syn. Fleischer's line. See iron line.
Kayser-Fleischer ring A ring of pigment granules containing copper located in Descemet's membrane around the periphery of the cornea. It has a brown or greyish-green colour to the unaided eye or golden brown to reddish colour when viewed through the slit-lamp and appears in nearly all cases of Wilson's disease.
Landolt ring See Landolt ring.
Newton's ring's Circular, concentric interference fringes surrounding a point of contact when two glass surfaces are pressed together. The thicker the air film separating the two surfaces the greater the number of concentric rings.
scleral ring The appearance of a white patch of sclera adjacent to the optic disc when the retinal pigment epithelium and the choroid do not extend to the optic disc.
r . scotoma See ring scotoma.
Soemmering's ring Lens remnants found within the periphery of the capsular bag. It may occur as a result of trauma, but more commonly following extracapsular cataract extraction. The pupillary area is usually left relatively free. See after-cataract; Elschnig's pearls.
Vossius' ring An annulus-shaped opacity imprinted on the anterior lens capsule and containing pigment from the posterior epithelium of the iris. It occurs as a result of a blunt trauma to the eye in which the aqueous pressure throws the iris forcefully against the lens. The ring is usually located sufficiently off-axis not to impair vision.
Wessley ring A disc-shaped greyish opacity made up of inflammatory cells consisting of antigen-antibody complexes located in the corneal stroma. It is seen in stromal interstitial keratitis resulting from a herpes simplex virus or disciform keratitis. The ring may attract neovascularization. Syn. immune ring of Wessley.
Patient discussion about ring
Q. What causes high pitch ringing in one ear?
Q. Tinnitus (Ringing and Other Ear Noise) Anybody have this problem? Urrrrrrrrrrr, I think I want to shoot myself,you know what I mean. It is worst than the chinese torture. Someone, please send me a good tip how to stop it. I have this for 4 yrs and it is driving me crazy. You cannot enjoy total complete silence. They say silence is golden but not when you have this ringgi in your ears. It gets worst when there is no noise. The only remedy I have is eating hot spicy curry, it helps for 2-3 wks and then it comes back again and then eating spicy food again. Listening to classical music helps to. Oh well.....just have to suck it up.
Q. How do you wake up in the morning if your narcolepsy is so severe you can't hear the alarm clock, phone ring? biggest problem is sleep paralysis, can't wake up. Late for work, everything, life is suffering because of severity. Have tried ritalin, natural supplements, hypnosis therapy, Provigal, antidepressants, nothing seems to work. Employer thinks it's an excuse, friends are irritated, I'm at my wits end. Life is spent sleeping more than awake.