Benefit of an electronic head‐mounted low vision aid

Michael D Crossland, Sandra D Starke, Piotr Imielski, James S Wolffsohn, Andrew R Webster

Research output: Contribution to journalArticle

Abstract

Purpose: To evaluate the efficacy of electronic head-mounted low vision aid (e-LVA) SightPlus (GiveVision, UK, givevision.net) and to determine which people with low vision would see themselves likely using an e-LVA like this. Methods: Sixty participants with low vision aged 18 to 93 used SightPlus during an in-clinic study session based on a mixed methods design. Visual acuity (ETDRS), contrast sensitivity (Pelli-Robson) and reading performance (MNREAD) were measured binocularly at baseline (no device), with the device in ‘normal’ mode (zoom only), and with preferred enhanced mode (zoom and one of four digital image enhancements). At the end of the session, a short questionnaire recorded willingness to use an e-LVA like SightPlus, potential use cases, positive/negative comments and adverse effects. Results: Binocular distance visual acuity improved significantly by 0.63 logMAR on average (p < 0.0001) to 0.20 logMAR. Contrast sensitivity improved significantly by 0.22 log units (p < 0.0001) to 1.21 log units with zoom only and by 0.40 log units to 1.37 log units with zoom and preferred image enhancement. Reading performance improved significantly for near visual acuity and critical print size (p < 0.015), although reading speed significantly decreased (p < 0.0001). Nearly half (47%) of the participants indicated they would use an e-LVA like SightPlus, especially for television, reading and entertainment (e.g. theatre). Multivariate logistic regression showed that proportion of lifetime affected by sight loss, baseline contrast sensitivity and use of electronic LVAs explained 41% of the variation in willingness to use. Conclusions: SightPlus improves visual function in people with low vision and would be used in its current form by one half of the people who tried it. Adverse effects were infrequent and resolved when the device was removed. Future work should focus on comparing e-LVAs through repeatable real-world tasks and impact on quality of life.

Original languageEnglish
Article number12646
Pages (from-to)422-431
Number of pages10
JournalOphthalmic and Physiological Optics
Volume39
Issue number6
DOIs
Publication statusPublished - 6 Nov 2019

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Low Vision
Contrast Sensitivity
Reading
Image Enhancement
Visual Acuity
Equipment and Supplies
Television
Logistic Models
Head
Quality of Life

Bibliographical note

This is the peer reviewed version of the following article: Crossland, MD, Starke, SD, Imielski, P, Wolffsohn, JS, & Webster, AR. Benefit of an electronic head‐mounted low vision aid. Ophthalmic Physiol Opt 2019; 39: 422– 431, which has been published in final form at https://doi.org/10.1111/opo.12646.  This article may be used for non-commercial purposes in accordance With Wiley Terms and Conditions for self-archiving.

Keywords

  • low vision
  • reading

Cite this

Crossland, M. D., Starke, S. D., Imielski, P., Wolffsohn, J. S., & Webster, A. R. (2019). Benefit of an electronic head‐mounted low vision aid. Ophthalmic and Physiological Optics, 39(6), 422-431. [12646]. https://doi.org/10.1111/opo.12646
Crossland, Michael D ; Starke, Sandra D ; Imielski, Piotr ; Wolffsohn, James S ; Webster, Andrew R. / Benefit of an electronic head‐mounted low vision aid. In: Ophthalmic and Physiological Optics. 2019 ; Vol. 39, No. 6. pp. 422-431.
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Crossland, MD, Starke, SD, Imielski, P, Wolffsohn, JS & Webster, AR 2019, 'Benefit of an electronic head‐mounted low vision aid', Ophthalmic and Physiological Optics, vol. 39, no. 6, 12646, pp. 422-431. https://doi.org/10.1111/opo.12646

Benefit of an electronic head‐mounted low vision aid. / Crossland, Michael D; Starke, Sandra D; Imielski, Piotr; Wolffsohn, James S; Webster, Andrew R.

In: Ophthalmic and Physiological Optics, Vol. 39, No. 6, 12646, 06.11.2019, p. 422-431.

Research output: Contribution to journalArticle

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N2 - Purpose: To evaluate the efficacy of electronic head-mounted low vision aid (e-LVA) SightPlus (GiveVision, UK, givevision.net) and to determine which people with low vision would see themselves likely using an e-LVA like this. Methods: Sixty participants with low vision aged 18 to 93 used SightPlus during an in-clinic study session based on a mixed methods design. Visual acuity (ETDRS), contrast sensitivity (Pelli-Robson) and reading performance (MNREAD) were measured binocularly at baseline (no device), with the device in ‘normal’ mode (zoom only), and with preferred enhanced mode (zoom and one of four digital image enhancements). At the end of the session, a short questionnaire recorded willingness to use an e-LVA like SightPlus, potential use cases, positive/negative comments and adverse effects. Results: Binocular distance visual acuity improved significantly by 0.63 logMAR on average (p < 0.0001) to 0.20 logMAR. Contrast sensitivity improved significantly by 0.22 log units (p < 0.0001) to 1.21 log units with zoom only and by 0.40 log units to 1.37 log units with zoom and preferred image enhancement. Reading performance improved significantly for near visual acuity and critical print size (p < 0.015), although reading speed significantly decreased (p < 0.0001). Nearly half (47%) of the participants indicated they would use an e-LVA like SightPlus, especially for television, reading and entertainment (e.g. theatre). Multivariate logistic regression showed that proportion of lifetime affected by sight loss, baseline contrast sensitivity and use of electronic LVAs explained 41% of the variation in willingness to use. Conclusions: SightPlus improves visual function in people with low vision and would be used in its current form by one half of the people who tried it. Adverse effects were infrequent and resolved when the device was removed. Future work should focus on comparing e-LVAs through repeatable real-world tasks and impact on quality of life.

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