Evaluation of a portable artificial vision device among patients with low vision

Abstract

IMPORTANCE Low vision is irreversible in many patients and constitutes a disability. When no treatment to improve vision is available, technological developments aid these patients in their daily lives. OBJECTIVE To evaluate the usefulness of a portable artificial vision device (OrCam) for patients with low vision. DESIGN, SETTING, AND PARTICIPANTS A prospective pilot studywas conducted between July 1 and September 30, 2015, in a US ophthalmology department among 12 patients with visual impairment and best-corrected visual acuity of 20/200 or worse in their better eye. INTERVENTIONS A 10-item test simulating activities of daily living was used to evaluate patients' functionality in 3 scenarios: using their best-corrected visual acuity with no low-vision aids, using low-vision aids if available, and using the portable artificial vision device. This 10-item test was devised for this study and is nonvalidated. The portable artificial vision device was tested at the patients' first visit and after 1 week of use at home. MAIN OUTCOMES AND MEASURES Scores on the 10-item daily function test. RESULTS Among the 12 patients, scores on the 10-item test improved from a mean (SD) of 2.5 (1.6) using best-corrected visual acuity to 9.5 (0.5) using the portable artificial vision device at the first visit (mean difference, 7.0; 95%CI, 6.0-8.0; P < .001) and 9.8 (0.4) after 1 week (mean difference from the first visit, 7.3; 95%CI, 6.3-8.3; P < .001). Mean (SD) scores with the portable artificial vision device were also better in the 7 patients who used other low-vision aids (9.7 [0.5] vs 6.0 [2.6], respectively; mean difference, 3.7; 95%CI, 1.5-5.9; P = .01). CONCLUSIONS AND RELEVANCE When patients used a portable artificial vision device, an increase in scores on a nonvalidated 10-item test of activities of daily living was seen. Further evaluations are warranted to determine the usefulness of this device among individuals with low vision.