The relationship between CA/C ratio and individual differences in dynamic accommodative responses while viewing stereoscopic images.

  • Fukushima T
  • Torii M
  • Ukai K
 et al. 
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Abstract

The oculomotor synergy as expressed by the CA/C and AC/A ratios was investigated to examine its influence on our previous observation that whereas convergence responses to stereoscopic images are generally stable, some individuals exhibit significant accommodative overshoot. Using a modified video refraction unit while viewing a stereoscopic LCD, accommodative and convergence responses to balanced and unbalanced vergence and focal stimuli (BVFS and UBVFS) were measured. Accommodative overshoot of at least 0.3 D was found in 3 out of 8 subjects for UBVFS. The accommodative response differential (RD) was taken to be the difference between the initial response and the subsequent mean static steady-state response. Without overshoot, RD was quantified by finding the initial response component. A mean RD of 0.11 +/- 0.27 D was found for the 1.0 D step UBVFS condition. The mean RD for the BVFS was 0.00 +/- 0.17 D. There was a significant positive correlation between CA/C ratio and RD (r = +0.75, n = 8, p < 0.05) for only UBVFS. We propose that inter-subject variation in RD is influenced by the CA/C ratio as follows: an initial convergence response, induced by disparity of the image, generates convergence-driven accommodation commensurate with the CA/C ratio; the associated transient defocus subsequently decays to a balanced position between defocus-induced and convergence-induced accommodations.

Author-supplied keywords

  • 13
  • 2009
  • 21
  • 9
  • accommodation
  • accommodative responses while viewing
  • b
  • c ratio and
  • citation
  • convergence
  • convergence-induced accommodation
  • defocus-induced accommodation
  • fukushima
  • gilmartin
  • individual differences in dynamic
  • j
  • journal of vision
  • k
  • m
  • s
  • stereo-display
  • stereoscopic image
  • stereoscopic images
  • t
  • the relationship between ca
  • torii
  • ukai
  • wolffsohn

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Authors

  • Tetsuya Fukushima

  • Masahito Torii

  • Kazuhiko Ukai

  • James S Wolffsohn

  • Bernard Gilmartin

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