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Detectability of Visual Field Defects in Glaucoma With High-resolution Perimetry
Takuya Numata1, Chota Matsumoto, Sachiko Okuyama
1Department of Ophthalmology, Kindai University Faculty of Medicine, Osaka, Japan.
Journal of Glaucoma
|July 2, 2016
Summary
High-resolution perimetry is crucial for detecting subtle glaucoma visual field defects. A test point resolution below 1.5 degrees is necessary for accurate assessment within 10 degrees of fixation.
Area of Science:
- Ophthalmology
- Visual Neuroscience
Background:
- Glaucoma is a leading cause of irreversible blindness.
- Early detection of visual field (VF) defects is critical for preserving vision.
- Subtle functional deficits may be missed by standard perimetry.
Purpose of the Study:
- To determine the optimal test point resolution for identifying glaucomatous VF defects.
- To assess the impact of varying test point resolutions on key perimetric indices.
Main Methods:
- High-resolution perimetry (0.5 degrees) was conducted on normal and glaucomatous eyes.
- Visual field profiles were analyzed at resolutions from 0.5 to 8.5 degrees.
- Mean Defect (MD), square root of loss variance (sLV), and maximum sensitivity loss (Max loss) were calculated.
Main Results:
- MD and sLV showed no significant differences with varying resolutions.
- Max loss differed significantly at resolutions ≥1.0 degree.
- Within the central 10 degrees, Max loss differed significantly at resolutions ≥1.5 degrees.
Conclusions:
- High-resolution perimetry (<1.5 degrees) is essential for detecting subtle VF defects.
- Accurate assessment of central visual field defects requires fine test point resolution.
