Related Experiment Videos
Variability of automated visual fields in clinically stable glaucoma patients
E B Werner1, B Petrig, T Krupin
1Department of Ophthalmology, Hahnemann University, Philadelphia, PA 19102.
Investigative Ophthalmology & Visual Science
|June 1, 1989
Summary
This study measured visual field variability in stable open-angle glaucoma patients. Results suggest potential criteria for detecting progressive visual field loss using variance-based calculations.
Area of Science:
- Ophthalmology
- Visual Neuroscience
Background:
- Open-angle glaucoma (OAG) management requires monitoring for progressive visual field loss.
- Clinically stable OAG patients on medical therapy may still exhibit visual field variability.
Purpose of the Study:
- To quantify total visual field variability in stable OAG patients.
- To explore methods for calculating visual field variability.
- To assess the potential for developing criteria to detect progressive visual field loss.
Main Methods:
- Analysis of 4 visual fields from 20 clinically stable OAG patients with >12 months follow-up.
- Utilized Octopus 201 perimeter for visual field testing.
- Calculated total variability using variance of threshold determinations and range-based methods.
Main Results:
- Average total variability was 2.8 decibels (db) (variance-based) and 5.1 db (range-based).
- Ninety-five percent of test locations showed <6 db variability (variance-based) and <13 db (range-based).
Conclusions:
- Visual field variability can be quantified in stable OAG patients.
- Variance-based calculation offers a potential method for detecting progressive visual field loss.
- Further development of criteria based on variability measures is warranted for glaucoma management.