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Published on: July 21, 2020
Peripherex Home Visual Field Demonstrates High Test-Retest Reliability, Validity
Justin Schweitzer1, Mitch Ibach1, John Berdahl1
1Vance Thompson Vision, Sioux Falls, SD, USA.
Purpose:
Assessment of disease and progression is one of the greatest unmet needs in glaucoma care. Moving visual field testing into the home stands to increase access and increase testing frequency to address these unmet needs. Here, we test a novel home-based app (Peripherex Visual Field Test or PRX-VFT) that leverages eye tracking in a short, "gamified" software environment, against in-office Humphrey Field Analyzer (HFA) data.
Methods:
Observational, multicenter, open-label clinical trial in patients diagnosed with glaucoma, glaucoma suspect, or ocular hypertension.
Results:
A total of 190 PRX tests were performed with 97 on the left eye and 93 on the right eye, derived from 36 eyes of 19 patients who also had reliable, matched HFA data. Patients were 58% female with a mean (SD) age of 61.5 (11.9) years (range 26-78). Test-retest reliability was good, with interclass correlation coefficient of 0.7596. Detection of abnormal fields was excellent, with a sensitivity of 95.7% and a negative predictive value (NPV) of 98.27%. Detection of normal fields was very good, with a specificity of 79.26% and a positive predictive value (PPV) of 66.36%. Patients reported that compared to HFA, PRX-VFT was easier and more fun to complete.
Conclusion:
In-home visual field testing using PRX-VFT on a patient's personal computer met its primary clinical trial endpoints, was feasible, and showed excellent statistical correlation to in-office HFA testing. PRX-VFT represents an opportunity for enhancing patient care at minimal additional equipment cost to the patient or healthcare system.
