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Related Experiment Videos

The SITA perimetric threshold algorithms in glaucoma.

J M Wild1, I E Pacey, E C O'Neill

  • 1Department of Vision Sciences, Aston University, Birmingham, United Kingdom.

Investigative Ophthalmology & Visual Science
|August 10, 1999
PubMed
Summary
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The Swedish Interactive Thresholding Algorithm (SITA) Standard and SITA Fast algorithms offer slightly better sensitivity in glaucoma testing than older methods. They also significantly reduce testing time, though they may detect deeper visual field defects.

Area of Science:

  • Ophthalmology
  • Visual electrophysiology
  • Glaucoma diagnostics

Background:

  • Automated perimetry is crucial for diagnosing and monitoring glaucoma.
  • Different algorithms exist for visual field testing, each with unique performance characteristics.
  • Understanding algorithm differences is key to accurate glaucoma management.

Purpose of the Study:

  • To compare the sensitivity of SITA Standard, SITA Fast, FASTPAC, and Full Threshold algorithms.
  • To assess within-visit and between-visit variability for these algorithms.
  • To evaluate algorithm performance in patients with stable primary open-angle glaucoma.

Main Methods:

  • Twenty-nine patients with stable primary open-angle glaucoma underwent visual field testing.
  • Four algorithms (SITA Standard, SITA Fast, FASTPAC, Full Threshold) were used on the Humphrey Field Analyzer 750.

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  • Testing was repeated across three separate visits to assess reliability.

    • Main Results:

    • SITA algorithms demonstrated marginally higher mean sensitivity compared to Full Threshold and FASTPAC.
    • SITA Fast showed increased sensitivity with greater defect depth.
    • Examination time was significantly reduced with SITA Standard and SITA Fast, especially in more severe cases.

    Conclusions:

    • SITA algorithms provide a slight improvement in differential light sensitivity for glaucoma detection.
    • These algorithms result in a statistically deeper detected defect.
    • A significant reduction in examination duration is a key benefit of SITA algorithms.