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Related Experiment Video

Updated: Jun 22, 2026

Motion-Acuity Test for Visual Field Acuity Measurement with Motion-Defined Shapes

Motion-Acuity Test for Visual Field Acuity Measurement with Motion-Defined Shapes

Published on: February 23, 2024

The Amsler grid in modern clothes.

¹Neuro-Ophthalmology Unit, Blue S. 7:5, SU/S, SE-413 45 Göteborg, Sweden. lars.frisen@neuro.gu.se

The British Journal of Ophthalmology

|May 28, 2009

Summary

A new digital Amsler grid, MacuFlow, offers quantitative analysis for visual field defects like scotomata and metamorphopsia. This internet-based tool improves accuracy and accessibility for remote patient evaluation.

Area of Science:

Ophthalmology
Optometry
Medical Imaging

Background:

The traditional Amsler chart is a standard tool for detecting central and paracentral visual field defects.
However, its printed format lacks quantitative analysis capabilities and can yield misleading results.
Assessing observer performance with the Amsler chart is challenging.

Purpose of the Study:

To develop a computer-based Amsler chart for quantitative assessment of visual field abnormalities.
To enhance diagnostic accuracy and observer performance evaluation in ophthalmology.
To create a readily accessible and electronically transferable visual field testing tool.

Main Methods:

A novel digital Amsler grid was designed using computer graphics with an optic flow sweeping pattern.

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This method ensures seamless visual field coverage and minimizes the Troxler effect.

Simulations of scotomata and metamorphopsia were used for quantitative performance evaluation.

Main Results:

Normal observers reliably detected paracentral scotomata (≥2 degrees).
Detection of grid deformation varied with eccentricity (4' near fixation to 20' at the border).
A patient with metamorphopsia demonstrated reproducible self-assessment of visual distortion.

Conclusions:

The digital MacuFlow test enhances the classical Amsler grid for quantitative measurements and quality control.
This internet-accessible tool facilitates remote evaluation of visual field test results.
MacuFlow represents a significant advancement in accessible and accurate visual field testing.