gonioscopy

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gonioscopy

 [go″ne-os´kah-pe]
examination of the angle of the anterior chamber of the eye with a gonioscope.
Miller-Keane Encyclopedia and Dictionary of Medicine, Nursing, and Allied Health, Seventh Edition. © 2003 by Saunders, an imprint of Elsevier, Inc. All rights reserved.

go·ni·os·co·py

(gō'nē-os'kŏ-pē),
Examination of the angle of the anterior chamber of the eye with a gonioscope or with a contact prism lens.
Farlex Partner Medical Dictionary © Farlex 2012

gonioscopy

(gō′nē-ŏs′kə-pē)
n.
Examination of the angle of the anterior chamber of the eye with a gonioscope or with a contact prism lens.
The American Heritage® Medical Dictionary Copyright © 2007, 2004 by Houghton Mifflin Company. Published by Houghton Mifflin Company. All rights reserved.

go·ni·os·co·py

(gō'nē-os'kŏ-pē)
Examination of the angle of the anterior chamber of the eye with a gonioscope or with a contact prism lens.
Medical Dictionary for the Health Professions and Nursing © Farlex 2012

gonioscopy

Observation of the angle of the anterior chamber of the eye with a gonioscope. When the angle is wide open all structures are visible (cornea, Schwalbe's line, trabecular meshwork, scleral spur, ciliary body); when the angle is closed only the cornea is seen. The width of the angle can be described according to either Shaffer classification (grade 4, wide open (35º-45º): grade 3, moderately open (25º-34º); grade 2, moderately narrow (20º); grade 1, very narrow (10º); grade 0, closed (0º), or Spaeth classification, which categorizes the angle estimated in degrees, as well as the location of the iris insertion and iris curvature. See Shaffer and Schwartz van Herick method.
direct gonioscopy Observation of the virtual, erect image of the angle of the anterior chamber as formed by a gonioscopic lens (e.g. Koeppe lens). The image can be viewed with a handheld magnification system with the patient in a supine position.
indentation gonioscopy Gonioscopy performed when the angle of the anterior chamber is closed in order to determine whether the closure is appositional or synechial. It is usually done with the four-mirror Zeiss lens by pressing the lens against the cornea forcing the aqueous into the peripheral part of the angle and pushing the iris posteriorly: If the angle is closed by apposition between the iris and cornea (appositional closure) the angle will open. If the angle is closed by adhesion between the iris and cornea (synechial closure) it will remain closed.
indirect gonioscopy Observation of the real, inverted image of the angle of the anterior chamber as formed by a gonioscopic lens, such as the Goldmann or Zeiss lens. The image is viewed through a biomicroscope. This is the most commonly used gonioscopic method.
Table G2 Structures of the angle of the anterior chamber as seen by gonioscopy in an individual in whom the angle is open and none of the structures is obscured by the iris
structure (anterior to posterior)anatomy/physiologynormal appearance
Schwalbe's lineposterior termination of Descemet's membranenot always discernible off-white ridge; pigment may collect on it
trabecular meshworksite of aqueous flow; covers internal part of Schlemm's canalvariable degree of pigmentation
scleral spurstrip of scleral tissuethin white line
ciliary body bandanterior face of ciliary body in the angle recesspigmented seen more easily if iris is moved backward
Millodot: Dictionary of Optometry and Visual Science, 7th edition. © 2009 Butterworth-Heinemann
References in periodicals archive ?
After anaesthetising the cornea with topical anaesthetic (eg proxymetacaine 0.5%), the goniolens is placed on the cornea (with coupling fluid such as Geltears, if needed).
Detailed ocular examination of both eyes were performed including best corrected visual acuity, slitlamp biomicroscopic examination, intra ocular pressure Angle evaluation by gonioscopy using Zeiss goniolens was done.
Emulsification of SiO was determined with visualization of the anterior chamber angle by using a Goldmann goniolens, biomicroscopic evaluation of the anterior chamber, and a dilated retinal exam.
Pilocarpine is often used to constrict the pupil and a goniolens is used for visualization of angle structures.
50 Patients diagnosed as primary angle closure disease using International Society of Geographical and Epidemiological Classification (ISGEO) based on the history and comprehensive ocular examination which includes best corrected VA by Snellen's Chart, Anterior Segment examination by Slit Lamp, IOP measurement by Goldman's applanation Tonometer, Gonioscopy by 4 Mirror Goniolens (Sussmann and Posner) and Posterior segment examination by stereo-biomicroscopy with +90 D Lens and Indirect Ophthalmoscopy by +20 D lens were studied.
Further, ELT requires expensive equipment and experience from the surgeon working with a direct-view goniolens.
Gonioscopy was done in all cases by Goldmann two mirror indirect goniolens for angle grading (graded according to Schaffer's criteria), pigmentation and presence of PEX material.