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Pupil cycle time in optic nerve compression.

J M Weinstein, J C Van Gilder, H S Thompson

    American Journal of Ophthalmology
    |February 1, 1980
    PubMed
    Summary
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    Pupil cycle time (PCT) effectively monitors optic nerve compression. PCT changes correlate with visual acuity and field responses, offering a simple, objective measure for patient follow-up.

    Area of Science:

    • Ophthalmology
    • Neuroscience
    • Clinical Medicine

    Background:

    • Compressive optic nerve diseases, such as chiasmal tumors and Grave's optic neuropathy, impair vision.
    • Monitoring optic nerve function is crucial for managing these conditions.

    Purpose of the Study:

    • To evaluate pupil cycle time (PCT) as an objective measure for assessing optic nerve conduction in patients with compressive optic neuropathy.
    • To determine if PCT changes correlate with treatment response.

    Main Methods:

    • Pupil cycle time was measured before and after treatment in 11 patients with compressive optic nerve disease.
    • Visual acuity and visual fields were assessed to evaluate treatment response.

    Main Results:

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  • All patients exhibited abnormal PCT in at least one eye prior to treatment.
  • PCT measurements improved or worsened in conjunction with visual acuity and visual field improvements or declines.
  • PCT changes mirrored the response to treatment.

    • Conclusions:

    • Pupil cycle time serves as a simple, objective office test for monitoring patients with optic nerve compression.
    • PCT can complement other objective clinical data like visual evoked response, disk pallor, and relative afferent pupillary defect.