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Correlation Between Visual Acuity and Automated Visual Field Foveal Threshold
Kamar S Abdullahi1, Asyvia Powell, Ziou Jiang
1University of Minnesota Medical School (KSA), University of Minnesota, Minneapolis, Minnesota; Department of Ophthalmology and Visual Neurosciences (AP, MSL), University of Minnesota, Minneapolis, Minnesota; and Biostatistical Design and Analysis Center (ZJ), Clinical and Translational Science Institute, University of Minnesota, Minneapolis, Minnesota.
Visual acuity strongly correlates with foveal threshold on Octopus perimetry. Higher foveal threshold values predict better visual acuity, offering a potential surrogate measure for patients unable to complete standard eye charts.
Area of Science:
- Ophthalmology
- Visual Neuroscience
- Medical Technology
Background:
- Previous research established a correlation between foveal threshold and visual acuity.
- This relationship had not been previously investigated using the Octopus perimeter.
Purpose of the Study:
- To investigate the correlation between foveal threshold measured by the Octopus perimeter and best-corrected visual acuity.
- To determine if foveal threshold can predict visual acuity, particularly in patients with limitations.
Main Methods:
- Automated visual field testing using the Octopus perimeter with the glaucoma tendency-oriented perimetry protocol.
- Visual acuity measurement with current refractive correction and pinhole, converted to logMAR for analysis.
- Spearman correlation coefficient was employed to analyze the relationship between visual acuity and foveal threshold.
Main Results:
- A statistically significant negative correlation was observed between visual acuity and foveal threshold (P < 0.001).
- Each 0.1 increase in logMAR visual acuity corresponded to a 1.2 dB decrease in foveal threshold (P < 0.001).
- A foveal threshold of ≥27.47 dB predicted visual acuity of 20/40 or better with 90% confidence.
Conclusions:
- Patient visual acuity is negatively correlated with foveal threshold obtained from Octopus automated visual field testing.
- Foveal threshold shows potential as a predictor of measured visual acuity.
- A web application was developed to predict visual acuity using foveal threshold, age, and ocular pathology status, aiding in cases where Snellen charts are not feasible.
