Subject Instructions and Methods of Target Presentation in Accommodation Research

Stark, Lawrence R. & Atchison, David A. (1994) Subject Instructions and Methods of Target Presentation in Accommodation Research. Investigative Ophthalmology and Visual Science, 35(2), pp. 528-537.


Purpose. The authors investigated the potential of subject instructions to alter the static accommodative stimulus-response function. They also investigated whether the reduced cue environment of the Badal optical system leads to accommodative responses different from those that occur for targets presented in real space. Methods. Static accommodative responses with three focusing instructions were compared to baselines obtained with minimal instruction to stabilize gaze. Static accommodative responses were recorded for targets presented in real space and in a Badal optical system. Results. Individuals differ widely in their responses to Instruction 1 (". . .make no special effort. . ."), although some adopt a relatively fixed position of focus. Responses with Instruction 2 (". . .look at the words naturally. . .") and Instruction 3 (". . .carefully focus. . .") baseline instruction ("pick a word in the middle of the block of text and look at it"). In a sample including most subjects, mean responses for Badal and real space targets are identical. However, it appears that some subjects have difficulty accommodating for Badal targets. Conclusions. The authors recommend the use of Instructions 2 and 3 for investigation of the static accommodative response, with a number of provisos. Accommodative responses to Badal and real space targets are generally equivalent, but researchers should take care to identify those persons who have difficulties accommodating for Badal target.

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57 citations in Scopus
55 citations in Web of Science®
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ID Code: 5100
Item Type: Journal Article
Refereed: Yes
Additional Information: For more information, please refer to the journal’s website (see link) or contact the author. Author contact details:
Additional URLs:
Keywords: accommodation research, subject instructions, target presentation
ISSN: 1552-5783
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 1994 The Association for Research in Vision and Ophthalmology
Deposited On: 28 Sep 2006 00:00
Last Modified: 15 Jan 2009 07:12

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