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:

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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 1

Stand Magnifier Optical Strategies

Gregg Baldwin, OD

Due to their optical characteristics, stand magnifiers are very different tools than other types of near low vision aids. The implications of these characteristics are important in clinical low vision practice. Since their magnification is in part determined by the spectacle add that is used with them, they should not be used as though they provide their labeled magnification. In addition, some stand magnifiers have maximum usable spectacle adds that limit their usefulness with some bifocals. In order to better understand the value of stand magnifiers, I have found it helpful to first understand how stand magnifier enlargement is fundamentally different from other types of magnification.

Visibility 11 Issue 3 & 4

Effect of Fluocinolone Acetonide 0.2μg/day (ILUVIEN®) Implant on the Decision to Drive in Patients with Diabetic Macular Edema

Donald Fletcher, MD; Laura Walker, PhD

The NEI-VFQ questionnaire was administered as part of the FAME phase 3 clinical trials. The driving subscale score (DSS), one of 12 subscale scores derived from the questionnaire, assesses driving difficulty in patients . The fluocinolone acetonide (FAc) 0.2μg/day implant is the only approved treatment for DME that continuously delivers therapy for 36 months with a single administration. This post hoc analysis was conducted to assess the relationship between improvement in visual acuity associated with 0.2μg/day FAc implant treatment and changes in the DSS over time and factors that may contribute to these findings.

Visibility 11 Issue 3 & 4

Do Blind and Visually Impaired Adults use the Mouth to Perceive Properties of Objects?

Andrea Urqueta Alfaro, PhD; Laura Walker; PhD; Chris Lee, PhD; Daisy Lei

Compared to sighted peers, blind and visually impaired (BVI) children demonstrate excessive and protracted mouthing of objects, which is thought to be non-functional and detrimental to hand skills development. However, BVI adults’ anecdotal accounts of using mouthing to perceive objects suggests that although this behavior is socially discouraged after infancy, it continues to provide BVI adults with valuable information about objects. Since young children may not be able to express why they mouth objects, this study will analyze interviews with BVI adults to identify object properties that are functionally and preferentially discriminated by the mouth.

Visibility 11 Issue 3 & 4

Assessing Fixation Stability in Macular Degeneration – How Long?

Arun Krishnan, PhD; Mehmet Ağaoğlu, PhD; Susana Chung, OD, PhD

There has been a renewed interest in investigating fixational eye movements in people with macular disease in the past decade. Fixation stability (FS) is associated with difficulties in daily tasks such as reading and facial recognition. Current studies on FS record eye movements for different durations ranging from a few seconds to several minutes. To our knowledge, how FS depends on the recording duration in people with macular disease remains unclear. Here, we report on the impact of duration of fixation recording on FS in subjects with bilateral macular disease.

Visibility 11 Issue 3 & 4

Impaired Fixation Stability in Amblyopia cannot be Explained by the Visual Acuity Impairment

Rajkumar Nallour Raveendran, PhD; William Bobier, OD, PhD; Vasudevan Lakshminarayanan, PhD; Benjamin Thompson, BSc, PhD

Amblyopia is associated with impaired visual acuity (VA) and reduced fixation stability (FS). The purpose of this study was to test whether artificially induced reductions in visual acuity affect FS.

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