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Effect of eye testing order on automated perimetry results using the Swedish Interactive Threshold Algorithm standard
Yaniv Barkana1, Yariv Gerber, Ricardo Mora
1Department of Ophthalmology, The New York Eye and Ear Infirmary, NY 10003, USA.
Archives of Ophthalmology (Chicago, Ill. : 1960)
|June 14, 2006
Summary
Changing the order of eye testing did not significantly impact visual field test results or reliability in glaucoma patients using the Swedish Interactive Threshold Algorithm (SITA) standard 24-2. Fixation loss remains a key factor in test unreliability.
Area of Science:
- Ophthalmology
- Visual Science
- Medical Technology
Background:
- Automated perimetry is crucial for glaucoma diagnosis and monitoring.
- The Swedish Interactive Threshold Algorithm (SITA) standard 24-2 is widely used for visual field testing.
- Potential intereye fatigue could influence test results when testing one eye after the other.
Purpose of the Study:
- To determine if altering the sequence of eye testing affects visual field Mean Deviation (MD) or test reliability.
- To assess the clinical significance of intereye fatigue in glaucoma patients undergoing visual field testing.
Main Methods:
- A cohort of glaucoma patients with prior SITA standard 24-2 results was studied.
- Patients underwent visual field testing with the right eye tested first, then the left eye tested first.
- Mean Deviation (MD) and reliability indices were compared across three successive tests for each eye.
Main Results:
- No statistically significant differences in MD or test reliability were observed between testing orders.
- Fixation loss was identified as the primary cause of unreliable visual field tests.
- Patient demographics included 47 individuals (29 women, 18 men) with a mean age of 70.6 years.
Conclusions:
- The order of eye testing does not significantly affect visual field test outcomes or reliability with SITA standard 24-2.
- Intereye fatigue appears to have minimal clinical impact with this algorithm.
- Addressing fixation loss is essential for improving the accuracy of automated perimetry in glaucoma assessment.
