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[Threshold-oriented suprathreshold perimetry and threshold value perimetry with the Tübigen CC Automated Perimeter. A
T M Wohlrab1, H Kreinberger, C Erb
1Abteilung: Allgemeine Augenheikunde mit Poliklinik, Universitäts-Augenklinik Tübingen.
Summary
The threshold splitting strategy for visual field testing is slower than the suprathreshold strategy for normal fields but faster for large scotomas. Differences in scotoma configuration arise due to varying test point densities.
Area of Science:
- Ophthalmology
- Visual Psychophysics
Background:
- Standard suprathreshold strategy (SSTS) is widely used for visual field testing.
- Threshold splitting strategy (TSS) offers potential advantages in visual field assessment.
Purpose of the Study:
- To compare the efficacy and efficiency of TSS versus SSTS.
- To determine if TSS offers advantages over the established SSTS.
Main Methods:
- 49 volunteers underwent visual field testing using both SSTS and TSS on the Tübinger Automatic Perimeter CC.
- SSTS examined 191 test points, while TSS examined 67 test points with a similar test-point design.
- Inclusion criteria included specific light sensitivity differences, fixation accuracy, and illumination class density.
Main Results:
- SSTS was 2-3 minutes quicker in normal visual fields or small scotomas.
- TSS took up to 15 minutes longer for large scotomas.
- Subjective differences in scotoma configuration were noted, particularly for smaller scotomas, due to TSS's sparser test point distribution.
Conclusions:
- TSS may be less efficient for normal or small scotomas compared to SSTS.
- TSS's test point density impacts scotoma configuration interpretation.
- Further research may be needed to optimize TSS for clinical use.