How do you read a gonioscopy?
Interpreting Your Gonioscopy View We recommend always starting your gonioscopy by viewing the inferior angle. This is typically the widest angle and the easiest to identify structures due to the increased pigmentation. Remember that, with indirect gonioscopy, your mirror is 180° away from the angle you are viewing.
What do we see in gonioscopy?
Gonioscopy is an eye examination to look at the front part of your eye (anterior chamber) between the cornea and the iris. Gonioscopy is a painless examination to see whether the area where fluid drains out of your eye (called the drainage angle) is open or closed.
What are the structures in the Irido corneal angle?
Conclusions. Fourier domain OCT is a reliable technique for the identification of the structures of the iridocorneal angle, among which can be highlighted are, the trabecular meshwork, Schlemm’s canal, scleral spur, and Schwalbe’s line.
What is direct gonioscopy?
Direct gonioscopy, as the term suggests, provides a straight-on view of the angle rather than the mirror image given by the indirect lenses. Direct gonioscopy permits the examiner to vary the angle of visualization more readily—to enable one to look over the curvature of iris bombé, for example.
How do I report findings in gonioscopy?
When documenting your gonioscopy findings, draw a large X to designate the four quadrants. Record the most posterior structure youve observed in each quadrant, and record the abnormalities and amount of pigment. Also, use the van Herick system for grading angle depth.
Why is gonioscopy important?
Gonioscopy, which enables visualization and magnification of the iridocorneal angle through the use of a gonioscopic lens, “is very important for the diagnosis of glaucoma in terms of our major divisions of glaucoma, open angle and closed angle.
What does poag mean in ophthalmology?
Primary open-angle glaucoma (POAG) is a leading cause of blindness with no known cure. Management of the disease focuses on lowering intraocular pressure (IOP) with current classes of drugs like prostaglandin analogs, beta-blockers, alpha-agonists, and carbonic anhydrase inhibitors.
What is gonioscopy principle?
Principle of gonioscopy When light passes from a medium with a greater index of refraction to a medium with lower index of refraction, the angle of refraction (r) becomes greater than the angle of incidence (i). i reaches a “critical angle” when r is equal to 90º.
What is normotensive glaucoma?
Normal-tension glaucoma (NTG), also known as low tension or normal pressure glaucoma, is a form of glaucoma in which damage occurs to the optic nerve without eye pressure exceeding the normal range. In general, a “normal” pressure range is between 12-22 mm Hg.
What is angle recession?
Separation between the longitudinal and circular muscle of the ciliary body (commonly caused by blunt injury to the eye)
How does Scheie describe the angle of a gonioscopy?
In his system one determines the angle structures that are visible on gonioscopy ( 6‑1 ). Larger numbers signify a narrower angle. The term “wide” was used to describe an angle in which all structures were visible. Scheie also described angle pigmentation on a scale from 0 (no pigmentation) to IV (heavy pigmentation) ( 6‑2 ).
How to interpret gonioscopic findings in the clinic?
Clinical interpretation of gonioscopic findings 1 GRADING OF CHAMBER ANGLE. There has been an evolution in the clinical methods used to describe the anterior chamber angle. 2 DIAGRAMMING ANGLE WIDTH, SYNECHIAE, AND PIGMENTATION. 3 TRABECULAR PIGMENT BAND. 4 SPAETH CLASSIFICATION.
How is gonioscopy used to examine the iris?
Gonioscopy is a good way to examine abnormalities of the iris. The view with gonioscopy is as if you are looking at the iris while you are standing on the crystalline lens and sticking your head up through the pupil. Therefore, gonioscopy makes it very easy to see elevation of an iris lesion (See Figure 4).
What are the advantages of a direct gonioscopy?
Direct gonioscopy 1 Allows for direct visualization of the chamber angle. 2 During direct gonioscopy, the viewer has an erect view of the angle structures. 3 Direct gonioscopy is most easily performed with the patient supine and in the operating room for an exam under anesthesia or a MIGS procedure.