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[Comparative study of various perimetry strategies]
P M Vivell1, B J Lachenmayr, P Zimmermann
1Universitäts-Augenklinik, München, Bundesrepublik Deutschland.
Fortschritte Der Ophthalmologie : Zeitschrift Der Deutschen Ophthalmologischen Gesellschaft
|January 1, 1991
Summary
The dynamic step unit (DSU) strategy for visual field testing is faster than the conventional 4/2 dB bracketing method. However, the DSU strategy shows reduced accuracy for relative defects.
Area of Science:
- Ophthalmology
- Visual field testing
Background:
- Conventional visual field testing uses a fixed 4/2 dB bracketing strategy.
- The dynamic step unit (DSU) strategy adjusts step size based on defect depth.
Purpose of the Study:
- To compare the speed and reproducibility of the DSU strategy against the conventional 4/2 dB bracketing strategy.
- To evaluate the intraindividual variability and performance in patients with visual field defects.
Main Methods:
- Testing normal subjects (3 normal subjects, 6 eyes) and patients (40 eyes) with both strategies (PERISTAT 433 and Humphrey-Field-Analyzer).
- Analyzing intraindividual variability and reproducibility through repeated tests.
Main Results:
- The DSU strategy demonstrated approximately 1.1 times better reproducibility in normal subjects.
- DSU strategy was 3 times faster with fewer exposures in patients with visual field defects.
- DSU strategy showed 1.6 times worse reproducibility for relative defects.
Conclusions:
- The dynamic step unit (DSU) strategy offers significant speed advantages in visual field testing.
- The DSU strategy's accuracy may be compromised for relative defects compared to the conventional method.