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Published on: February 23, 2017
Stabilization and comparison of TOP and Bracketing perimetric strategies using a threshold spatial filter
Manuel Gonzalez de la Rosa1, Marta Gonzalez-Hernandez, Tinguaro Diaz Aleman
1Hospital Universitario de Canarias, Universidad de La Laguna, Canary Islands, Spain. mgdelarosa@jets.es
Summary
A new spatial filter stabilizes visual field perimetry results by accounting for region dependencies. This filter harmonizes results between TOP and Bracketing (BRA) strategies, reducing variability and improving reliability in glaucoma assessment.
Area of Science:
- Ophthalmology
- Medical Technology
- Visual Science
Background:
- Glaucoma visual field testing requires reliable perimetric data.
- Existing methods may not fully account for spatial dependencies within the visual field.
- Developing advanced filters can enhance diagnostic accuracy.
Purpose of the Study:
- To evaluate a novel perimetric spatial filter designed for glaucomatous visual fields.
- To assess the filter's impact on data variability and consistency between different testing strategies.
Main Methods:
- A spatial filter was applied to perimetric data from 51 glaucoma patients and 30 controls.
- The filter uses a weighted average of a threshold and its four best-correlated neighboring points.
- Two perimetric strategies, TOP and Bracketing (BRA), were compared before and after filtering.
Main Results:
- The spatial filter significantly reduced variability in the square root of loss variance (sLV) and short-term fluctuation for both TOP and BRA strategies.
- Filtering increased the similarity of results between TOP and BRA, particularly for sLV.
- The filter minimized the occurrence of non-reproducible false scotomas in normal subjects.
Conclusions:
- The proposed spatial filter effectively stabilizes perimetric results in glaucoma assessment.
- The filter demonstrated a greater stabilizing effect on the BRA strategy compared to TOP.
- This harmonization of results enhances the reliability and comparability of perimetric data.