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Intratest variability in conventional and high-pass resolution perimetry.
1Department of Ophthalmology, University of British Columbia, Vancouver, Canada.
Ophthalmology
|January 1, 1991
Summary
Intratest variability in visual field testing increases with age and threshold using conventional perimetry. Resolution perimetry, however, shows no significant effect of these factors, suggesting more reliable visual field information.
Area of Science:
- Ophthalmology
- Visual Science
- Medical Technology
Background:
- Intratest variability is a critical factor in the reliability of visual field testing.
- Conventional perimetry methods may be influenced by patient age and visual threshold.
Purpose of the Study:
- To investigate the impact of threshold, age, and visual field location on intratest variability.
- To compare the performance of conventional manual perimetry with high-pass resolution perimetry.
Main Methods:
- 11 normal subjects (ages 15-50) were tested using Tübinger (conventional) and Ring (resolution) perimeters.
- Testing occurred at multiple visual field locations.
- Frequency-of-seeing curves were used to estimate threshold and intratest variability.
Main Results:
- Conventional perimetry showed increased intratest variability with higher thresholds (P=0.031) and older age (P=0.012).
- Resolution perimetry demonstrated no significant effect of threshold, age, or location on intratest variability (P>0.225).
- While thresholds correlated between methods, intratest variability did not.
Conclusions:
- Resolution perimetry offers a potentially more reliable method for visual field assessment by reducing intratest variability.
- This technology may overcome limitations of conventional perimetry, especially concerning age and threshold effects.