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Related Experiment Videos

Sensitivity of Swedish interactive threshold algorithm compared with standard full threshold algorithm in Humphrey

G C Sekhar1, T J Naduvilath, M Lakkai

  • 1L.V. Prasad Eye Institute, Hyderabad, India. gcs@lvpeye.stph.net

Ophthalmology
|July 13, 2000
PubMed
Summary
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Swedish interactive threshold algorithm (SITA) strategies are faster and sensitive for glaucoma testing compared to standard full threshold (SFT). SITA Standard shows excellent repeatability, while SITA Fast

Area of Science:

  • Ophthalmology
  • Visual Sciences
  • Medical Technology

Background:

  • Automated perimetry is crucial for diagnosing and monitoring glaucoma.
  • The Humphrey Field Analyzer is a standard device for visual field testing.
  • Evaluating new algorithms like SITA is essential for improving testing efficiency and accuracy.

Purpose of the Study:

  • To compare the sensitivity and repeatability of Swedish interactive threshold algorithm (SITA) strategies against the standard full threshold (SFT) algorithm.
  • To assess the time efficiency of SITA Standard (SS) and SITA Fast (SF) compared to SFT.
  • To evaluate the extent of defect detection by SITA strategies.

Main Methods:

  • Observational case series involving 48 glaucoma patients experienced in automated perimetry.

Related Experiment Videos

  • Central 30-2 visual field testing using SFT, SITA Standard (SS), and SITA Fast (SF) strategies.
  • Comparison of sensitivity, repeatability, time saved, and defect extent across the algorithms over 4 weeks.

    • Main Results:

    • SITA Standard (SS) and SITA Fast (SF) demonstrated high sensitivity (95.12% and 92.68%).
    • Significant time savings were achieved with SS (53.12%) and SF (70.69%).
    • Excellent repeatability was observed for SFT and SS, while SF showed variable repeatability. SITA strategies detected more defects with increasing mean deviation.

    Conclusions:

    • SITA strategies offer a good balance of sensitivity and significantly improved speed over SFT for glaucoma testing.
    • SITA Standard (SS) provides excellent repeatability, comparable to SFT.
    • SITA Fast (SF) is the fastest but exhibits variable repeatability, requiring careful consideration in clinical application.