Benefits of electronic vision enhancement systems (EVES) for the visually impaired

Rachael C. Peterson, James S. Wolffsohn*, Martin Rubinstein, John Lowe

*Corresponding author for this work

Research output: Contribution to journalArticle

Abstract

PURPOSE: To examine whether objective performance of near tasks is improved with various electronic vision enhancement systems (EVES) compared with the subject's own optical magnifier. DESIGN: Experimental study, randomized, within-patient design. METHODS: This was a prospective study, conducted in a hospital ophthalmology low-vision clinic. The patient population comprised 70 sequential visually impaired subjects. The magnifying devices examined were: patient's optimum optical magnifier; magnification and field-of-view matched mouse EVES with monitor or head-mounted display (HMD) viewing; and stand EVES with monitor viewing. The tasks performed were: reading speed and acuity; time taken to track from one column of print to the next; follow a route map, and locate a specific feature; and identification of specific information from a medicine label. RESULTS: Mouse EVES with HMD viewing caused lower reading speeds than stand EVES with monitor viewing (F = 38.7, P < .001). Reading with the optical magnifier was slower than with the mouse or stand EVES with monitor viewing at smaller print sizes (P < .05). The column location task was faster with the optical magnifier than with any of the EVES (F = 10.3, P < .001). The map tracking and medicine label identification task was slower with the mouse EVES with HMD viewing than with the other magnifiers (P < .01). Previous EVES experience had no effect on task performance (P > .05), but subjects with previous optical magnifier experience were significantly slower at performing the medicine label identification task with all of the EVES (P < .05). CONCLUSIONS: Although EVES provide objective benefits to the visually impaired in reading speed and acuity, together with some specific near tasks, some can be performed just as fast using optical magnification. © 2003 by Elsevier Inc. All rights reserved.

Original languageEnglish
Pages (from-to)1129-1135
Number of pages7
JournalAmerican Journal of Ophthalmology
Volume136
Issue number6
Early online date26 Nov 2003
DOIs
Publication statusPublished - Dec 2003

Keywords

  • electronic vision enhancement system
  • hospital ophthalmology
  • low-vision clinc
  • visually impaired
  • optical magnification
  • improving portability
  • reduced price

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