Chaotic Analysis of Focal Accommodation and Pupil Area during the VDT Work

Hirokazu IWASE  Masatoshi KITAOKA  Juvy BALINGIT  Atsuo MURATA  

Publication
IEICE TRANSACTIONS on Information and Systems   Vol.E87-D    No.9    pp.2258-2261
Publication Date: 2004/09/01
Online ISSN: 
DOI: 
Print ISSN: 0916-8532
Type of Manuscript: LETTER
Category: Software Engineering
Keyword: 
accommodation,  pupil area,  chaotic analysis,  fractal dimension,  first Lyapunov exponent,  

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Summary: 
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.


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