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.

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.

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.

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.

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
References in periodicals archive ?
Various parameters obtained with dual Scheimpflug imaging devices correlate well with gonioscopy. (13) However, ACA measurement by dual Scheimpflug devices may not be accurate because the entire angle is not fully visible due to total internal reflection.
Situation was considered stable for this patient, but regular checkups for angle status assessment (gonioscopy, UBM, AS-OCT) and IOP measurement are necessary for a proper follow up.
The ocular examination included: Best corrected vision in both eyes; Intra ocular pressure measurement by Schiotz tonometer; Complete anterior segment evaluation done including lids, lashes, conjunctiva, sclera, cornea, anterior chamber, iris, pupil, lens and eye movements, Posterior segment evaluation included cup disc ratio, disc pallor, neuro retinal rim, hemorrhages on disc margin; Gonioscopy with Volk four mirror goniolens was performed and diagnosis of glaucoma confirmed.
All patients underwent a full ophthalmic examination including visual acuity, refraction, intraocular pressure as measured using Goldmann applanation tonometry, gonioscopy, and a dilated fundus examination.
The preoperative measurements included best-corrected visual acuity (BCVA) using LogMAR chart records, slit lamp and fundus examination, IOP measurement using Goldmann applanation tonometry, the extent of PAS recorded via gonioscopy, axial length measurement using IOLMaster (Carl Zeiss Meditec; Germany), and corneal endothelial cell density (ECD) by noncontact specular microscopy (Tomey EM-3000, Nagoya, Japan).
The patients underwent complete ophthalmological examination that included assessment of visual acuity, examination of anterior eye segment, applanation tonometry, pachymetry, gonioscopy, and dilated fundus examination.
Gungor et al., used biomicroscopy and gonioscopy to investigate early signs of pseudoexfoliation (PEX) syndrome in the supposedly healthy fellow eye of patients with unilateral PEX syndrome.
Gonioscopy showed open angles with anterior insertion of the iris root.
The global ophthalmology devices, diagnostics and surgical equipment market report provides market size estimates (Revenue USD million - 2013 to 2020) for key market segments based on diagnostic devices (autorefractometers, corneal topographers, fluorescein angiography, fundus cameras, gonioscopy, keratometry, ophthalmic echography (ultrasound), ophthalmoscopy, OCT systems, pachymetry, perimeters, slit lamps, specular microscopy, tonometry), surgical devices (contact lenses, spectacle lenses, vision care, cataract, glaucoma, refractive, and vitreoretinal surgery devices), its applications (diagnostics, surgical, and vision care), and also forecasts growth trends (CAGR% - 2016 to 2020).
All patients were assessed and recorded preoperatively for their IOP, vision, depth of anterior chamber (ACD), angle of anterior chamber by gonioscopy and glaucoma medications being used.
Clinical assessment of primary congenital glaucoma was performed by Slit lamp Tonometry Gonioscopy Perimetry and Retinal Nerve Fiber Layer Assessment (RNFL) at Mayo Hospital Lahore.
* Gonioscopy. In this test, a special lens containing a mirror is placed lightly on the front of the eye so the health care professional can visually examine the angle between the cornea and the iris inside the eye.