Vergence control across saccades in dyslexic adults

Elisabeth Moores, J P Frisby, D Buckley, E Reynolds

Research output: Contribution to journalArticle

Abstract

Many aspects of vision have been investigated in developmental dyslexia. Some research suggests deficits in vergence control (e.g. Buzzelli, 1991, Optom. Vision Sci. 68, 842±846), although ability to control vergence across saccades has not yet been investigated. We have explored this question indirectly using Enright's (1996 Vision Res. 36, 307±312.) sequential stereopsis task. The task requires observers to set two adjacent targets (whose textures cannot be resolved simultaneously if either is fixated) to appear equi-distant. Enright has argued that sequential stereopsis stereoacuity thresholds offer an indication of vergence control across saccades. We report two experiments using a total of 17 dyslexic and 18 control adults. Performance was measured on a sequential stereopsis task and an ordinary `simultaneous' stereopsis task. No significant differences between groups were found. However, whereas practice of the sequential task lowered control group thresholds on the simultaneous task, for the dyslexic group it significantly raised thresholds, suggesting that visual fatigue is especially important in investigations of visual functions in dyslexia. Although the small samples used limit conclusions at this stage, the main sequential stereopsis results suggest that, if Enright is correct, dyslexic adults can show normal vergence control across saccades.
Original languageEnglish
Pages (from-to)452 -462
Number of pages11
JournalOphthalmic and Physiological Optics
Volume18
Issue number5
DOIs
Publication statusPublished - 1988

Fingerprint

Depth Perception
Saccades
Dyslexia
Asthenopia
Aptitude
Control Groups
Research

Keywords

  • dyslexia
  • stereopsis
  • sequential test
  • exploration
  • human
  • communication disorder
  • language disorder
  • reading disorder

Cite this

Moores, Elisabeth ; Frisby, J P ; Buckley, D ; Reynolds, E. / Vergence control across saccades in dyslexic adults. In: Ophthalmic and Physiological Optics. 1988 ; Vol. 18, No. 5. pp. 452 -462.
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Vergence control across saccades in dyslexic adults. / Moores, Elisabeth; Frisby, J P; Buckley, D; Reynolds, E.

In: Ophthalmic and Physiological Optics, Vol. 18, No. 5, 1988, p. 452 -462.

Research output: Contribution to journalArticle

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