Chaotic analysis of focal accommodation and pupil area during the VDT work

Hirokazu Iwase, Masatoshi Kitaoka, Juvy Balingit, Atsuo Murata

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)


The purpose of this research is to show that the stress during the VDT task could be evaluated using the chaotic features for the focal accommodation system and the pupil area. The result of this experiment shows that the fractal dimension for the pupil area can be used to evaluate the stress during the VDT task. Moreover, it is shown that the chaotic property in the fixed target measurement is higher than that in the linear control and step control measurements. However, the first Lyapunov exponent hardly changed over time for all of three accommodation measurements.

Original languageEnglish
Pages (from-to)2258-2261
Number of pages4
JournalIEICE Transactions on Information and Systems
Issue number9
Publication statusPublished - Sept 2004
Externally publishedYes


  • Accommodation
  • Chaotic analysis
  • First Lyapunov exponent
  • Fractal dimension
  • Pupil area

ASJC Scopus subject areas

  • Software
  • Hardware and Architecture
  • Computer Vision and Pattern Recognition
  • Electrical and Electronic Engineering
  • Artificial Intelligence


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