Acute Angle-Closure Glaucoma (AACG) Workup

Updated: Apr 07, 2023
  • Author: Albert P Lin, MD; Chief Editor: Inci Irak Dersu, MD, MPH  more...
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Imaging Studies

Ultrasound biomicroscopy (UBM) and anterior segment optical coherence tomography (AS-OCT)

These imaging techniques can be used to visualize the angle and surrounding structures. They can provide objective and quantitative measurements to document changes to the angle before and after treatment. However, clinical assessment and the use of gonioscopy may be more practical and applicable if a patient has acute angle closure (AAC). [15]


Other Tests

The anterior chamber angle cannot be visualized through a slit lamp because the light reflected from the angle is reflected back into the eye. Gonioscopy is performed by applying a gonioscope onto the cornea after administration of a topical anesthetic. Four mirror lenses are useful to diagnose and, possibly, to break the block by applying pressure. It allows the clinician to quickly and accurately assess the angle without expensive machinery. It is an essential component of an ophthalmic examination in patients with suspected narrow angle and in patients with AAC.