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Comparison of Swedish interactive threshold algorithm and full threshold algorithm for glaucomatous visual field

Y Aoki1, G Takahashi, K Kitahara

  • 1Department of Ophthalmology, Jikei University School of Medicine, 3-25-8 Nishi-shimbashi, Minato-ku, Tokyo 105-8461, Japan. yo.koao@jikei.ac.jp

European Journal of Ophthalmology
|April 7, 2007
PubMed
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The Swedish interactive threshold algorithm standard (SITA-SS) identified more visual field loss in early glaucoma patients than the full threshold (FT) method. SITA-SS also revealed shallower and larger defects, potentially due to its lower variability.

Area of Science:

  • Ophthalmology
  • Visual field testing
  • Glaucoma diagnosis

Background:

  • Glaucoma is a leading cause of irreversible blindness.
  • Accurate visual field defect detection is crucial for early glaucoma diagnosis and management.
  • Automated perimetry is a key diagnostic tool, with different algorithms offering varying sensitivities and specificities.

Purpose of the Study:

  • To compare the prevalence of visual field loss between the standard full threshold (FT) and Swedish interactive threshold algorithm (SITA) standard (SS) procedures.
  • To analyze sensitivity distribution, defect size, and depth of glaucomatous visual field defects.
  • To evaluate these parameters in patients with early or suspected glaucoma.

Main Methods:

  • Retrospective analysis of automated perimetry findings.

Related Experiment Videos

  • Study included 53 patients (105 eyes) diagnosed with early or suspected glaucoma.
  • Comparison of visual field defect measurements obtained using FT and SITA-SS algorithms.

    • Main Results:

    • SITA-SS identified a significantly higher number of eyes with glaucomatous visual field loss (48 eyes) compared to FT (35 eyes).
    • Defects measured by SITA-SS were significantly larger (11.2 vs. 9.7 units, p<0.05) and shallower (larger decibel scores: 206.2 vs. 162.1 dB, p=0.02) than those measured by FT.
    • SITA-SS demonstrated lower intersubject variability in sensitivity measurements at most locations compared to FT.

    Conclusions:

    • The SITA-SS algorithm detects a higher prevalence of visual field defects in early glaucoma compared to FT.
    • Glaucomatous defects are characterized as larger and shallower when assessed with SITA-SS.
    • The observed differences may be attributed to SITA-SS's lower variability and Bayesian statistical properties.