Pupillary Response as an Indicator of Fatigue Associated with Two Visual Display Devices for Directory Assistance Operation

  • T. Geacintov
  • W. S. Peavler
Part of the Symposion der Deutschen Ophthalmologischen Gesellschaft book series (OPH.GES.)


A review by Bell Laboratories of the Directory Assistance Operation in order to identify labor or time saving methods and devices resulted in an examination of two new systems for storage and retrieval of customer listings:
  1. 1.

    A computer-based telephone-number bank called Directory Assistance System/Computer (DAS/C), and

  2. 2.

    A microfilm-based telephone listing called Directory Assistance System/Microfilm (DAS/M).



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  3. Lowenstein, O., Feinberg, R., Loewenfeld, I. E.: Pupillary movements during acute and chronic fatigue. Investigative Ophthalmology 2, 138–157, (1963).Google Scholar
  4. Loewenfeld, I. E.: Personal communication, 1971.Google Scholar

Copyright information

© J. F. Bergmann, München 1973

Authors and Affiliations

  • T. Geacintov
    • 1
  • W. S. Peavler
    • 1
  1. 1.New BrunswickUSA

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