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Related Experiment Videos

Full threshold versus quantification of defects for visual field testing in glaucoma.

W C Stewart1, M B Shields, A R Ollie

  • 1Department of Ophthalmology, Medical University of South Carolina, Charleston.

Graefe'S Archive for Clinical and Experimental Ophthalmology = Albrecht Von Graefes Archiv Fur Klinische Und Experimentelle Ophthalmologie
|January 1, 1989
PubMed
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The full threshold visual field test detects more shallow defects than the faster quantification of defects test, potentially altering glaucoma diagnosis. Full threshold testing is more comprehensive for glaucoma screening.

Area of Science:

  • Ophthalmology
  • Optometry
  • Visual Science

Background:

  • Glaucoma and ocular hypertension are significant causes of vision loss.
  • Accurate visual field testing is crucial for diagnosing and monitoring these conditions.
  • The Humphrey Field Analyzer is a standard tool for visual field assessment.

Purpose of the Study:

  • To compare the diagnostic value of two Humphrey Field Analyzer programs: full threshold and quantification of defects.
  • To evaluate the time efficiency and diagnostic accuracy of each testing method.
  • To determine if the less time-consuming quantification of defects method provides comparable diagnostic information to the full threshold method.

Main Methods:

  • Visual field testing was performed on 19 glaucoma patients, 17 ocular hypertensives, and 16 normal subjects.

Related Experiment Videos

  • Two Humphrey Field Analyzer programs were used: full threshold and quantification of defects.
  • The quantification of defects program targeted points deviating more than 6 dB from normal.

    • Main Results:

    • The average testing time per eye was 13 minutes 11 seconds for full threshold and 4 minutes 22 seconds for quantification of defects.
    • Diagnoses differed in 18 out of 104 tested fields.
    • Differences were primarily due to shallow defects, detected by full threshold but missed by quantification of defects, which could alter diagnostic categories.

    Conclusions:

    • The full threshold testing method detects more subtle visual field defects compared to the quantification of defects method.
    • While faster, the quantification of defects program may miss shallow defects that could be clinically significant for glaucoma diagnosis.
    • Full threshold testing remains more comprehensive for identifying early or subtle glaucomatous visual field changes.