What are the limitations of a visual field exam in the diagnosis 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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Other points of importance when considering a diagnosis of POAG are described below.

Disc cupping and nerve fiber layer loss of up to 40% have been shown to occur before actual visual field loss has been detected. Therefore, visual field examination cannot be the sole tool used to determine when a patient has begun to sustain undeniable glaucomatous damage, and it should not be used in isolation as the benchmark for treatment.

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