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Open AccessArticle

User Friendliness of a Wearable Visual Behavior Monitor for Cataract and Refractive Surgery

Eye Clinic Orasis, Swiss Eye Research Foundation, Titlisstrasse 44, 5734 Reinach AG, Switzerland
Department of Physics, Faculty of Sciences, University of Novi Sad, Trg Dositeja Obradovica 4, 21000 Novi Sad, Serbia
Division of Ophthalmology, Department of Clinical Neurosciences, Geneva University Hospitals, 1205 Geneva, Switzerland
Faculty of Medicine of the Military Medical Academy, University of Defense, 11000 Belgrade, Serbia
Vivior AG, Technoparkstrasse 1, 8005 Zürich, Switzerland
Author to whom correspondence should be addressed.
Appl. Sci. 2020, 10(6), 2190;
Received: 23 December 2019 / Revised: 5 March 2020 / Accepted: 17 March 2020 / Published: 24 March 2020
(This article belongs to the Special Issue Engineering for Surgery)
A prospective feasibility study was conducted to determine whether a new wearable device, the Visual Behavior Monitor (VBM), was easy to use and did not present any difficulties with the daily activities of patients. Patients for cataract surgery and refractive lens exchange were randomly selected and screened for inclusion in the study. A total of 129 patients were included in the study as part of a multicenter study. All measurements were performed before surgery. Upon inclusion, patients were trained to wear the device, instructed to wear it for a minimum of 36 h, and were scheduled to return in one week. The VBM measures the distance at which patients’ visual activities are performed, the level of illumination, and head translational and rotational movements along the three axes. On the follow-up visit, patients completed a questionnaire about their experience in wearing the device. All patients underwent standard diagnostic testing, with their cataract grade determined by the Lens Opacities Classification System (LOCS) classification. Results indicate that 87% of patients felt comfortable using the wearable device while 8% of patients responded as not feeling comfortable (5% of patients did not respond to the question). In addition, 91% of patients found it easy to attach the wearable to the magnetic clip while 4% of patients did not find it easy, and 5% of patients did not respond. Overall, patients found the device easy to use, with most reporting that the device was not intrusive. View Full-Text
Keywords: cataract surgery; refractive surgery; visual behavior monitor cataract surgery; refractive surgery; visual behavior monitor
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Pajic, B.; Zakharov, P.; Pajic-Eggspuehler, B.; Cvejic, Z. User Friendliness of a Wearable Visual Behavior Monitor for Cataract and Refractive Surgery. Appl. Sci. 2020, 10, 2190.

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