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Systematic and Random Mapping Errors in Structure - Function Analysis of the Macula.

Giovanni Montesano^1,2,3, Luca M Rossetti², Davide Allegrini⁴

¹Optometry and Visual Sciences, City, University of London, London, UK.

Translational Vision Science & Technology

|May 18, 2021

Summary

This summary is machine-generated.

Mapping perimetric stimuli accurately is crucial for structure-function analysis. Eye movements and fixation eccentricity significantly increase spatial error, especially in glaucoma patients, necessitating careful consideration in analysis.

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Area of Science:

Ophthalmology
Neuroscience
Medical Imaging

Background:

Accurate structure-function mapping is essential for diagnosing and monitoring neurodegenerative diseases like glaucoma.
Perimetric testing relies on precise stimulus localization, which can be affected by patient eye movements and fixation stability.

Purpose of the Study:

To quantify the spatial error in mapping perimetric stimuli for structure-function analysis.
To evaluate the impact of different mapping schemes and eye movements on spatial accuracy.

Main Methods:

Analyzed data from 17 healthy and 30 glaucomatous participants using spectral-domain optical coherence tomography and a fundus tracking perimeter.
Quantified retinal location mapping error and fixation stability (95% bivariate contour ellipse area) under various conditions, including fixation eccentricity and eye movements.
Employed generalized linear mixed models for statistical analysis.

Main Results:

Rotating the perimetric grid to align with the fovea-disc axis significantly increased mapping error.
Eye movements, particularly gaze attraction to stimuli, and eccentric fixation substantially contributed to projection error, with a more pronounced effect in glaucoma patients.
Removing eye movements evoked by stimuli significantly reduced fixation spread.

Conclusions:

Rotating the perimetric grid is not recommended for improving mapping accuracy.
Fixation eccentricity and instability are significant sources of spatial error in perimetry and must be accounted for in structure-function analyses, especially for glaucoma patients.