What is the role of gonioscopy in the evaluation of primary open-angle glaucoma (POAG)?

Updated: Mar 16, 2020
  • Author: Kristin Schmid Biggerstaff, MD; Chief Editor: Inci Irak Dersu, MD, MPH  more...
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Perform gonioscopy to rule out angle-closure or secondary causes of IOP elevation, such as angle recession, pigmentary glaucoma, and PXF.

Check the peripheral contour of the iris for plateau iris, and examine the trabecular meshwork for peripheral anterior synechiae, as well as neovascular or inflammatory membranes.

The Schlemm canal may be seen with blood refluxing through the canal into the posterior trabecular meshwork. This possibly could indicate elevated episcleral venous pressure, with such conditions as carotid-cavernous fistula, Graves orbitopathy, or Sturge-Weber syndrome needing to be ruled out.

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