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[Pupillographic perimetry using the "Octopus"].

E Alexandridis, H Krastel

    Fortschritte Der Ophthalmologie : Zeitschrift Der Deutschen Ophthalmologischen Gesellschaft
    |January 1, 1989
    PubMed
    Summary
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    This study introduces a novel pupilloperimetric program for the Octopus 2000 perimeter, integrating infrared videopupillography to objectively assess visual field thresholds. This method enhances diagnostic accuracy by analyzing pupil responses, reducing potential malingering.

    Area of Science:

    • Ophthalmology
    • Neuroscience
    • Medical Technology

    Context:

    • Standard visual field testing relies on subjective patient responses, which can be unreliable.
    • Pupil light response (PLR) offers an objective measure of visual pathway function.
    • Integrating PLR with perimetry can improve the accuracy of visual field assessment.

    Purpose:

    • To develop and evaluate a pupilloperimetric program for the Octopus 2000 perimeter.
    • To combine infrared videopupillography with computerized perimetry for simultaneous fixation control and PLR recording.
    • To establish a method for objective visual field threshold determination using pupillary responses.

    Summary:

    • A Sargon-based pupilloperimetric program was developed for the Octopus 2000, utilizing infrared videopupillography to record direct pupil light responses.

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  • The system digitally processes pupil video at 25 cps, displaying responses on an oscilloscope and via penwriter printout for immediate analysis.
  • Thresholds are determined by examiner assessment of pupil responses at 12 visual field locations, offering an objective alternative to subjective patient reports.

    • Impact:

    • This pupilloperimetric approach minimizes the influence of subjective patient reporting, potentially identifying malingering.
    • It offers a more objective and reliable method for visual field assessment in ophthalmology.
    • The system provides a hard copy of both pupil responses and subjective ratings, aiding in the verification of patient cooperation.