Preliminary Evaluation of Two Digital Image Processing Strategies for Head-Mounted Magnification for Low Vision Patients

• DOI: 10.1167/tvst.8.1.23
• Publication Date: 2019-02-28T23:31:14Z
• Authors: Ashley D. Deemer; Bonnielin K. Swenor; Kyoko Fujiwara; James T. Deremeik; Nicole C. Ross; Danielle M. Natale; Chris K. Bradley; Frank S. Werblin; Robert W. Massof
• Keywords: Optical head-mounted display

In an observational clinical outcome study, we tested the effectiveness and use of combination two innovative approaches to magnification: a virtual bioptic telescope projection screen, implemented with digital image processing in head-mounted display (HMD) equipped high-resolution video camera head trackers.We recruited 30 participants best-corrected visual acuity <20/100 better-seeing eye bilateral central scotomas. Participants were trained on HMD system, then completed 7- 10-day in-home trial. The Activity Inventory was administered before after home trial measure effect system self-reported function. A simulator sickness questionnaire (SSQ) system-use survey administered. Rasch analysis used assess outcomes.Significant improvements seen functional ability measures estimated from goal difficulty ratings (Cohen's d = 0.79, P < 0.001), reading (d 1.28, 0.001) information 1.11, tasks. There no improvement patient-reported motor function or mobility. One participant had moderately severe discomfort symptoms SSQ item calibration. average patient rating system's 7.14/10.Use resulted vision processing. Lack mobility is most likely due limited field view, poor depth perception, lack binocular disparity.We determine if these new magnification are beneficial low patients performing everyday activities.