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Frequency doubling perimetry in glaucoma.

Ravi Thomas1, S Bhat, J P Muliyil

  • 1Department of Ophthalmology, Schell Eye Hospital, Vellore, Tamil Nadu, India.

Journal of Glaucoma
|February 1, 2002
PubMed
Summary
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Frequency Doubling Perimetry (FDP) effectively detects glaucoma field defects. A specific scoring system demonstrated high sensitivity and specificity, validating FDP as a reliable screening tool for glaucoma.

Area of Science:

  • Ophthalmology
  • Visual Neuroscience

Background:

  • Glaucoma is a leading cause of irreversible blindness.
  • Early detection of glaucomatous field defects is crucial for timely intervention.
  • Frequency Doubling Perimetry (FDP) is a visual field testing method.

Purpose of the Study:

  • To assess the diagnostic accuracy of Frequency Doubling Perimetry (FDP) for identifying glaucomatous visual field abnormalities.
  • To compare the performance of different FDP testing strategies and scoring algorithms.

Main Methods:

  • The study included 85 patients with diagnosed glaucoma and 48 healthy controls.
  • Participants underwent standard Swedish Interactive Testing Algorithm (SITA) perimetry and various FDP screening tests (C20-1, C20-5, full threshold).
  • Sensitivity and specificity were calculated using established and novel algorithms.

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Main Results:

  • A specific scoring system achieved the highest sensitivity (85.9%) and specificity (95.1%) in detecting glaucomatous defects.
  • Sensitivity increased to 91% for moderate to severe glaucoma cases.
  • Quantifying defect severity did not enhance detection rates.

Conclusions:

  • Frequency Doubling Perimetry (FDP) is a valid and effective screening method for glaucoma detection.
  • The scoring system developed by Patel et al. yielded the optimal performance for FDP in this study.