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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Education and research delivered right to your inbox! Have the opportunity for correspondence CEs while receiving the latest in low vision clinical and research findings. Article categories include:

  • Clinical Practice
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  • Research: reviews and abstracts
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  • Practice management issues
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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

Copyright © 2018 Envision University. Individual articles are Copyright © 2018 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 12 Issue 4

Low Vision Patients’ Preferences for Light Intensity and Color Temperature During Near Reading

Ava Bittner, OD, PhD; Samantha McIntosh, OD; Katherine Green, OD; Samantha Kayser, OD; Rakin Khan; Anushka Mistry

A previous study found that reading improved when low vision (LV) patients used an LED illuminated hand-held magnifier with their preferred color temperature. However, this study did not explore differences in color temperature preference according to ocular disease. Another study reported that patients with age-related macular degeneration (AMD) preferred great levels of illumination for near reading than glaucoma patients. We explored whether lighting preferences for near reading were related to inner versus outer retinal degeneration in a more clinically heterogeneous LV population with AMD and/or glaucoma, or various other ocular diseases.

Visibility 12 Issue 3

Categories of Factors Related to the Non-use of Magnifying Low Vision Aids: A scoping Review

Marie-Céline Lorenzini, ORT; Walter Wittich, PhD, CLVT

Several studies have examined the multifactorial decision process around the (non-)use of assistive technologies (ATs). High variability rates for non-use of low vision aids have been reported. Determinants of AT (non-)use, have been categorized into personal, AT-related, environmental and interventional factors. It is probable that these factors also apply to the use of low vision aids (LVAs). The aim of this scoping review was to explore factors related to magnifying LVAs (non-)use, building on an existing classification into four factors related to AT non-use in general and medical adherence.

Visibility 12 Issue 3

The Impact of Aging on Braille Reading Performance

Natalie Martiniello, MSc; Walter Wittich, PhD, CLVT

Vision Rehabilitation Therapists encounter a growing number of working-age and older adults with acquired vision loss, and reading difficulties are among the most common reasons for referral to vision rehabilitation services. While sight enhancement solutions (magnification) may be beneficial to those with functional vision, the use of methods such as braille provide additional options for those with fluctuating or significant visual diagnoses. The goal of this study was to synthesize knowledge about the impact of aging on factors related to braille usage, as a precursor to the development of protocols to meet the needs of adult and senior braille clients.

Visibility 12 Issue 3

Validation of the International Reading Speed Texts in a Canadian North-American Sample

Elliott Morrice, MA; Julian Hughes, BSc; Zoey Stark, Walter Wittich, PhD, CLVT; Aaron Johnson, PhD

The aim of these two studies was to validate the International Reading Speed Texts (IReSTs) in a normally sighted English-speaking Canadian North American (CNA) sample with and without a simulated reduction in visual acuity.

Visibility 12 Issue 2

Investigating the Potential Role of Gene Mutations in the Age-related Macular Degeneration: Cognitive Impairment Co-morbidity

Caitlin Murphy, PhD; Robert Koenekoop, MD, PhD; Olga Overbury, PhD

The number of seniors affected by Age-related Macular Degeneration (AMD) and early cognitive changes is on the rise. Recent studies have shown a high co-occurrence of these conditions. This, along with the structural similarities in the brain and retina, shared disease risk factors and similar histopathology suggest AMD and cognitive impairment may share genetic risk factors as well. The goal of this study was to explore the possibility of known AMD SNPs contributing to the co-morbidity.

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