A peer-reviewed quarterly publication dedicated to professional education for optometrists, vision scientists, occupational therapists, ophthalmologists and other low vision practitioners.

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Visibility (ISSN 2330-0965 – Print) (ISSN 2330-0973 – Online) is published quarterly by Envision University, 610 N. Main Wichita, KS 67203 (316) 440-1515 (opens in new window)

Copyright © 2021 Envision University. Individual articles are Copyright © 2021 of the indicated authors, printed with permission. All rights reserved. No part of this publication may be reproduced or transmitted in any form or by any means, electronic or mechanical, including photocopying, recording or any information storage or retrieval system, without written permission of Envision University.

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Visibility 15 Issue 3, 2021

Do drivers with macular degeneration use advanced driver assistance systems? – A telephone questionnaire study

Jing Xu, PhD; Abbie Hutton; Güler Arsal; Rui Ni, PhD; Bradley Dougherty, OD, PhD; Alex R. Bowers, PhD

Drivers with Macular Degeneration (MD) may experience difficulties in many driving situations because of their vision loss. Recently developed advanced driver assistance systems (ADAS), including blind spot warning and forward collision warning systems, have the potential to mitigate these difficulties and maintain driving safety for these drivers. The goal of this study is to identify the driving difficulties and the perceived need and preferences for ADAS technology of drivers with and without MD.

Visibility 15 Issue 2, 2021

High Plus Lens Power Measurement Reliability in a Clinical Low Vision Setting

Bennett McAllister, OD; Frank Spors, PhD; Tyler Phan, OD

Magnifiers can be specified by magnification (M) or equivalent power (Fe). When comparing these two, Fe is the only independent and constant descriptor and therefore preferred in low vision practice. Yet, Fe in high plus lenses cannot be easily nor reliably measured with a clinical instrument, such as a lensometer. This study looks for the shortest possible distance under which unknown high plus lenses/magnifiers can be measured and still yield clinically acceptable Fe values.

Visibility 15 Issue 2, 2021

Potential Transferable Skills from Eccentric Viewing Training

Caitlin Murphy, PhD, CLVT; Hana Boxerman, MSc, CLVT; William Seiple, PhD; Ross Clark, PhD; Karen H. Li, PhD; Julie-Andrée Marinier, OD, MSc3; Aaron Johnson, PhD

Fixation stability is frequently targeted and trained in visual rehabilitation practices to improve reading accuracy and speed. However, it has yet to be investigated in terms of improvements beyond reading. Previous researchers have shown that fixation stability is a visual parameter that can contribute towards the control of balance. Therefore, improved fixation as a consequence of eccentric-viewing training may provide additional benefits in improving balance. Here, researchers collaborate with low vision rehabilitation specialists to quantify fixation stability before and after an eccentric viewing training program, and determine if this can lead to increased use of visual information to improve both reading and balance.

Visibility 15 Issue 1, 2021

Predictors of Employment Among Adults with Vision Impairment in Canada

Shikha Gupta, PhD; Walter Wittich, PhD, FAAO, CLVT; Mahadeo Sukhai, PhD

Employment is an important determinant of health and overall quality of life for individuals with vision impairment. Current evidence suggests that employment rates for people with vision impairments are lower than general population. The purpose of our research study was to identify modifiable and non-modifiable factors that contribute to positive or negative employment outcomes among adults with vision impairments.

Visibility 15 Issue 1, 2021

An examination of Fixation Stability and Balance in Vision Impairment

Sophie Hallot; Stephanie Pietrangelo, BSc; Caitlin Murphy, PhD, CLV; Karen Li, PhD; Aaron Johnson, PhD

Vision is second only to the vestibular system in terms of its contribution to balance. It is well documented that individuals with a vision impairment often have diminished balance abilities, as assessed by self-report and physiological measures. Central vision loss, such as that in age-related macular degeneration, forces individuals to rely more on their remaining peripheral vision. This can result in lower visual acuity and less stable fixation. The purpose of this study was to determine if reduced balance and postural stability observed in vision impairment is related to unstable fixation.

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