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Related Experiment Videos

Comparison between monkey and human visual fields using a personal computer system.

Masaaki Sasaoka1, Hideaki Hara, Katsuki Nakamura

  • 1Department of Behavioral and Brain Sciences, Primate Research Institute, Kyoto University, Aichi, Japan.

Behavioural Brain Research
|May 21, 2005
PubMed
Summary

Researchers developed a precise system to measure monkey visual fields, finding differences compared to humans. This tool aids in studying blindness-causing eye diseases and drug effects.

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Area of Science:

  • Ophthalmology
  • Neuroscience
  • Comparative Physiology

Background:

  • Accurate measurement of primate visual fields is crucial for modeling human eye diseases.
  • Existing methods for assessing monkey visual fields lack precision.
  • Understanding visual field similarities and differences between monkeys and humans is necessary for effective disease modeling.

Purpose of the Study:

  • To establish a precise method for measuring the visual field in monkeys.
  • To compare visual field properties between monkeys and humans.
  • To validate a new system for assessing visual function in non-human primates.

Main Methods:

  • Developed a new personal computer-based system for precise visual field measurement.
  • Measured luminance-contrast sensitivity in the central 24 degrees of the visual field.

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  • Recorded eye position continuously and excluded data with fixation loss.
  • Included four monkeys and three humans as subjects.

    • Main Results:

    • The new system demonstrated high and stable behavioral performance in both monkeys and humans.
    • Luminance-contrast sensitivity was highest at the fovea and decreased with eccentricity.
    • The temporal blind spot was detected at 15 degrees.
    • Humans exhibited higher overall visual sensitivity than monkeys, with a sharper decline in the periphery for monkeys.

    Conclusions:

    • The developed system provides a convenient and reliable method for measuring monkey visual fields.
    • This system is suitable for basic ophthalmologic research and evaluating drug effects on visual function.
    • Significant differences in visual sensitivity and peripheral function exist between monkeys and humans.