December 2007
Volume 7, Issue 15
Free
OSA Fall Vision Meeting Abstract  |   December 2007
The relationship between CA/C ratio and individual differences in dynamic accommodative responses while viewing stereoscopic images
Author Affiliations
  • Tetsuya Fukushima
    School of Science and Engineering, Waseda University
  • Masahito Torii
    School of Science and Engineering, Waseda University
  • Kazuhiko Ukai
    School of Science and Engineering, Waseda University
Journal of Vision December 2007, Vol.7, 65. doi:10.1167/7.15.65
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      Tetsuya Fukushima, Masahito Torii, Kazuhiko Ukai; The relationship between CA/C ratio and individual differences in dynamic accommodative responses while viewing stereoscopic images. Journal of Vision 2007;7(15):65. doi: 10.1167/7.15.65.

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Abstract

An overshoot in dynamic accommodation is often observed when a step in the convergence stimulus is presented (e.g., a change in depth in a stereoscopic image). However, the overshoot is not observed in all subjects (Torii et el., J Mod Opt, in press). The accommodative overshoot may occur as a result of influences from convergence-induced accommodation, which is the first phase of the accommodative response, and blur-induced accommodation. In the present study, we examined the hypothesis that the overshoot appears when an individual's CA/C ratio is high. Stereoscopic images were presented on a parallax-barrier LCD display. Accommodative responses were measured using a modified video refractor. CA/C and AC/A ratios were measured respectively by blurring stimulus and by occluding one eye using the same instruments. The results showed that CA/C and AC/A ratios are negatively correlated as shown previously and that amplitude of the overshoot is large in subjects with high CA/C ratios. We conclude that the transient overshoot in accommodative responses is caused by excess convergence accommodation.

Fukushima, T. Torii, M. Ukai, K. (2007). The relationship between CA/C ratio and individual differences in dynamic accommodative responses while viewing stereoscopic images [Abstract]. Journal of Vision, 7(15):65, 65a, http://journalofvision.org/7/15/65/, doi:10.1167/7.15.65. [CrossRef]
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