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Related Experiment Videos

Proximal and cognitively-induced accommodation.

M Rosenfield1, K J Ciuffreda

  • 1Schnurmacher Institute for Vision Research, Department of Vision Sciences, SUNY/State College of Optometry, New York 10010.

Ophthalmic & Physiological Optics : the Journal of the British College of Ophthalmic Opticians (Optometrists)
|July 1, 1990
PubMed
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Cognitive demand significantly altered proximally-induced accommodation (PIA) in some individuals. This interaction between cognitive and proximal accommodation may complicate studies on non-optical accommodation components.

Area of Science:

  • Ophthalmology
  • Neuroscience
  • Cognitive Science

Background:

  • Proximally-induced accommodation (PIA) is a key visual response.
  • Understanding factors influencing PIA, like cognitive load, is crucial for visual science.

Purpose of the Study:

  • To investigate the effect of varying cognitive demand on proximally-induced accommodation (PIA).
  • To determine if cognitive tasks influence the magnitude of PIA.

Main Methods:

  • PIA was measured by comparing open-loop accommodative responses to stimuli at different distances (6m and 0.33m).
  • The vergence and accommodation loops were opened using monocular pinhole viewing (0.5 mm).
  • Cognitive demand was manipulated by having participants either relax (listening to music) or perform mental arithmetic (counting backwards in sevens).

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Main Results:

  • Increased cognitive demand caused a significant change (greater than +/- 1.00 D) in PIA for 4 out of 12 subjects.
  • This suggests an interaction between cognitive and proximal accommodation in a subset of individuals.

Conclusions:

  • Cognitive load can modulate proximally-induced accommodation in some people.
  • This interaction highlights a potential confound in research aiming to isolate non-optical components of accommodation.