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Related Experiment Videos

A frequency-doubling perimetric study in normal-tension glaucoma with hemifield defect

Y Kondo1, T Yamamoto, Y Sato

  • 1Department of Ophthalmology, Gifu University School of Medicine, Japan.

Journal of Glaucoma
|August 26, 1998
PubMed
Summary

Frequency-doubling perimetry (FDP) shows promise in detecting early glaucomatous visual field defects in normal-tension glaucoma patients. FDP identified defects in intact hemifields, suggesting its utility for early detection.

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Area of Science:

  • Ophthalmology
  • Visual Neuroscience

Background:

  • Normal-tension glaucoma (NTG) presents diagnostic challenges, particularly in identifying early glaucomatous changes.
  • Conventional differential light sensitivity (DLS) perimetry may miss subtle visual field defects in the early stages of NTG.

Purpose of the Study:

  • To prospectively compare the diagnostic capabilities of frequency-doubling perimetry (FDP) and DLS perimetry.
  • To evaluate FDP's effectiveness in detecting early glaucomatous visual field defects in NTG patients with existing hemifield defects.

Main Methods:

  • Eleven eyes of NTG patients with hemifield defects were studied.
  • Both FDP and DLS perimetry were performed within seven days.
  • Scanning laser ophthalmoscopy was used to quantify nerve fiber layer defects (NFLD).

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Main Results:

  • Seven of eleven intact hemifields showed NFLD, and six of these also had defects detected by FDP.
  • FDP identified visual field defects in intact hemifields, suggesting potential for early detection.
  • Threshold values between FDP and DLS did not significantly correlate.

Conclusions:

  • Frequency-doubling perimetry may be a valuable tool for detecting early glaucomatous visual field defects.
  • FDP's ability to identify defects in seemingly intact hemifields warrants further investigation in NTG management.