A New Graphical Tool for Assessing Visual Field Progression in Clinical Populations

Translational Vision Science & Technology
Susan R Bryan, David P Crabb

Abstract

We demonstrate a new approach for assessing and visualizing visual field (VF) progression in clinics. Two summary measures for VF progression, Rate of Progression (RP) and Loss of Sight Years (LSY), are combined with a novel visualization (Hedgehog Plots). RP is calculated per eye using linear regression of mean deviation (MD) against time of follow-up. LSY is a novel parameter, linked to actuarial data, which estimates the number of years that a patient will have advanced bilateral VF loss in their predicted remaining lifetime. Every eye is given a rank within the sample based on RP and LSY allowing for "priority" patients to be identified. We illustrate differences between the parameters with an experiment comparing the cases flagged as "priority" by each method using data from 1263 VF records. RP for every eye in a "clinic" can be visualized and assessed using a Hedgehog Plot. Eyes are ranked against all other eyes by RP and LSY; these parameters provide different and complementary information on a patient's VF progression status. A purpose written interactive application demonstrating the techniques is available in the public domain at https://crabblab.shinyapps.io/hedgehog. Hedgehog Plots provide a tool for visualizing VF ...Continue Reading

Software Mentioned

Hedgehog Plots
SITA Standard
Hedgehog Plot
VF progression
SITA Fast
Medisoft

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