Sensitivity and specificity of the Swedish interactive threshold algorithm for glaucomatous visual field defects

Area of Science:

• Ophthalmology
• Medical Technology
• Diagnostic Imaging

Background:

• Glaucoma is a leading cause of irreversible blindness worldwide.
• Accurate and efficient visual field testing is crucial for early glaucoma detection and management.
• Traditional visual field testing methods can be time-consuming.

Purpose of the Study:

• To evaluate the diagnostic performance of two novel visual field algorithms: Swedish interactive threshold algorithm (SITA) standard and SITA fast.
• To compare the sensitivity and specificity of SITA standard and SITA fast against the full threshold algorithm for detecting glaucomatous visual field defects.

Main Methods:

• A prospective observational case series design was employed.
• Ninety healthy individuals and 82 glaucoma patients participated in the study.
• Visual fields were assessed using the Humphrey visual field analyzer 30-2 program with full threshold, SITA standard, and SITA fast algorithms.

Main Results:

• SITA standard demonstrated an overall sensitivity of 98% and SITA fast showed 95% for glaucomatous defects.
• Both algorithms achieved 96% specificity for detecting glaucoma.
• SITA fast reduced testing time by up to 72%, and SITA standard by up to 52%, compared to full threshold testing.

Conclusions:

• SITA standard and SITA fast algorithms offer high sensitivity and specificity for identifying glaucomatous visual field loss.
• These advanced algorithms provide significant time savings for both patients and clinicians.
• The findings support the clinical utility of SITA standard and SITA fast in routine glaucoma screening and monitoring.