Monocular accommodation response for totally occluded objects

Stark, Lawrence R. & Atchison, David A. (2002) Monocular accommodation response for totally occluded objects. Optometry and Vision Science, 79(10), pp. 658-666.


ABSTRACT: Purpose. To investigate the accuracy and stability of the monocular accommodation response when attention is directed toward a totally occluded distant object. Methods. A static infrared optometer was used to measure the monocular accommodative response in 16 participants while they viewed a distant letter target in the presence or absence of an intervening object that totally occluded the distant target from view. Participants were instructed to attend to and focus for the distant target. Results. Participants differed widely in their accommodative responses for a totally occluded distant object, focusing close to the distant object, close to the intervening object, in between the two objects, and beyond the distant object. Some of this variability could be attributed to individual differences in the dark focus. Accommodation was more variable when the distant target was totally occluded by an obstruction at an intermediate distance (50 cm). Conclusions. Many individuals focus poorly in the presence of a visual obstruction that totally occludes the object of regard.

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ID Code: 5484
Item Type: Journal Article
Refereed: Yes
Additional Information: The contents of this journal can be freely accessed online via the journal's web page (see link) 12 months after publication. Self-archiving of the author-version is not yet supported by this publisher.
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Keywords: accommodation, defocus, visual obstruction, conflicting stimuli, vehicle, aviation
ISSN: 1538-9235
Subjects: Australian and New Zealand Standard Research Classification > MEDICAL AND HEALTH SCIENCES (110000) > OPTOMETRY AND OPHTHALMOLOGY (111300)
Divisions: Current > QUT Faculties and Divisions > Faculty of Health
Current > Institutes > Institute of Health and Biomedical Innovation
Copyright Owner: Copyright 2002 Lippincott Williams & Wilkins
Deposited On: 01 Dec 2006 00:00
Last Modified: 15 Jan 2009 07:15

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