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Threshold variability using different Goldmann stimulus sizes
L B Gilpin1, W C Stewart, H H Hunt
1Department of Ophthalmology, Medical University of South Carolina, Charleston.
Acta Ophthalmologica
|December 1, 1990
Summary
Varying Goldmann stimulus sizes on the Humphrey Field Analyzer did not reduce threshold fluctuation in healthy subjects. Size III stimulus showed results consistent with prior research, with no significant benefit from other sizes.
Area of Science:
- Ophthalmology
- Visual Science
- Perimetry
Background:
- Visual field testing is crucial for diagnosing and monitoring optic nerve disorders.
- Threshold fluctuation in visual field testing can impact diagnostic accuracy.
- Goldmann stimulus sizes are commonly used in perimetry, but their effect on fluctuation is not fully understood.
Purpose of the Study:
- To investigate the impact of different Goldmann stimulus sizes (I-V) on threshold fluctuation during Humphrey Field Analyzer testing in healthy individuals.
- To determine if altering stimulus size affects the reliability of visual field measurements.
Main Methods:
- Ten healthy subjects underwent Humphrey Field Analyzer testing.
- Goldmann stimulus sizes ranging from I to V were utilized.
- Threshold fluctuation was measured and compared across different stimulus sizes.
Main Results:
- Threshold fluctuation components for the size III stimulus were consistent with previous studies.
- Increased total fluctuation was observed with smaller Goldmann stimulus sizes (I and II).
- Similar fluctuation levels were noted for larger stimulus sizes (IV and V) compared to size III.
Conclusions:
- Changing the Goldmann stimulus size from III does not offer an advantage in reducing threshold fluctuation for normal individuals on the Humphrey Field Analyzer.
- Size III remains a reliable choice for visual field testing in healthy subjects.
- The findings suggest that stimulus size has a limited impact on threshold fluctuation in normal visual fields.
