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Long-term and short-term fluctuation in pattern discrimination perimetry.
W C Stewart1, D M Kelly, H H Hunt
1Department of Ophthalmology, Medical University of South Carolina, Charleston 29425-2236.
American Journal of Ophthalmology
|September 15, 1992
Summary
Threshold fluctuation in pattern discrimination fields was studied in healthy subjects. Intraindividual fluctuation increased with eccentricity, but overall fluctuation allows adequate separation of normal from abnormal measurements.
Area of Science:
- Ophthalmology
- Visual Neuroscience
Background:
- Pattern discrimination is crucial for visual function.
- Understanding threshold fluctuation is essential for accurate visual field testing.
Purpose of the Study:
- To investigate threshold fluctuation in pattern discrimination within the central 30 degrees of vision.
- To determine factors influencing fluctuation, including eccentricity, age, and errors.
Main Methods:
- Studied 24 healthy subjects using a pattern discrimination perimeter at 56 central locations.
- Measured stimulus discrimination on a percentage scale, analyzing intraindividual and interindividual fluctuation.
- Assessed correlation with eccentricity, age, false-positive errors, and visual hemifields.
Main Results:
- Intraindividual fluctuation was 10.52%, interindividual was 8.78%.
- Intraindividual fluctuation increased significantly with eccentricity (P < .05).
- No significant correlation found with age, false-positive errors, or hemifield differences.
Conclusions:
- Threshold fluctuation is a key consideration in interpreting pattern discrimination fields.
- The observed fluctuation levels generally permit effective differentiation between normal and abnormal results.
- Eccentricity influences intraindividual fluctuation, highlighting its importance in visual field analysis.