The bifixation field as a function of viewing distance

Grove, Philip M., Mapp, Alistair P. and Ono, Hiroshi (2014) The bifixation field as a function of viewing distance. Journal of Ophthalmology, 2014 1-13. doi:10.1155/2014/274803


Author Grove, Philip M.
Mapp, Alistair P.
Ono, Hiroshi
Title The bifixation field as a function of viewing distance
Journal name Journal of Ophthalmology   Check publisher's open access policy
ISSN 2090-0058
2090-004X
Publication date 2014-01-01
Year available 2014
Sub-type Article (original research)
DOI 10.1155/2014/274803
Open Access Status DOI
Volume 2014
Start page 1
End page 13
Total pages 13
Place of publication New York, NY, United States
Publisher Hindawi Publishing Corporation
Language eng
Abstract Hering reported that the area over which he could bifixate a target was smaller at near convergence distances than far convergence distances and predicted that in extreme horizontal gaze positions, the temporally directed eye lags behind the nasally directed eye. We tested these predictions using a subjective index of eye position. Experiment 1 confirmed that the bifixation field was significantly smaller at near convergence distances. When bifixation broke down at the near distance, the nasally directed eye lagged behind the temporally directed eye for all observers. At the far distance, the nasally directed eye preceded the temporally directed eye for four of six observers. Experiment 2 also confirmed that the bifixation field was smaller at near convergence distances but the nasally directed eye always lagged behind the temporally directed eye at the limits of the bifixation field. We confirmed Hering's first prediction that the bifixation field is smaller at near convergence distances than at far ones. However, the majority of our results indicate that the nasally directed eye lags behind the temporally directed eye at the limits of the bifixation field, contrary to Hering's prediction. We conclude that the eyes drift toward their tonic state of vergence when fusion breaks.
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: Official 2015 Collection
School of Psychology Publications
 
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