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Related Experiment Videos

Test-retest variability in visual field testing using frequency doubling technology.

A Horani1, S Frenkel, E Z Blumenthal

  • 1Department of Ophthalmology, Hadassah University Hospital, and Hebrew University-Hadassah Medical School, Jerusalem 91120, Israel.

European Journal of Ophthalmology
|April 7, 2007
PubMed
Summary
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Test-retest variability (TRV) in frequency doubling technology (FDT) visual fields (VF) for normal subjects is uniform across the visual field. FDT VF variability is more consistent than other perimetry methods.

Area of Science:

  • Ophthalmology
  • Neuroscience
  • Medical Technology

Background:

  • Visual field (VF) testing is crucial for detecting and monitoring various ocular and neurological conditions.
  • Frequency Doubling Technology (FDT) offers a unique method for assessing VF sensitivity.
  • Understanding test-retest variability (TRV) is essential for accurate interpretation of VF results.

Purpose of the Study:

  • To quantify the test-retest variability (TRV) in normal subjects using serial visual fields (VF) with the Frequency Doubling Technology (FDT) instrument.
  • To assess the uniformity of TRV across different regions of the visual field.
  • To compare FDT VF variability with other perimetric methods.

Main Methods:

  • Twenty-one healthy adults (aged 23-60) underwent four serial FDT VF tests (Zeiss-Humphrey FDT analyzer, C-20 program) on one eye.

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  • Tests were spaced 2-4 days apart, with two preliminary tests to minimize learning effects.
  • TRV was calculated as the standard deviation of sensitivity values at each location across the four tests.

    • Main Results:

    • The mean TRV for the entire visual field was 2.44 ± 1.32 dB.
    • Mean TRV was relatively uniform across superior, inferior, nasal, and temporal hemifields (ranging from 2.40 to 2.48 dB).
    • TRV was also consistent across foveal, central, and peripheral locations (ranging from 2.16 to 2.54 dB).

    Conclusions:

    • Test-retest variability in FDT visual fields is uniform across the tested visual field.
    • FDT VF variability is more consistent than standard and short-wavelength automated perimetry.
    • A strong inverse correlation exists between mean sensitivity and TRV in normal subjects.