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Related Experiment Videos

Time-related variation in normal automated static perimetry.

A E Searle1, J M Wild, D E Shaw

  • 1Academic Department of Ophthalmology, University of Birmingham, United Kingdom.

Ophthalmology
|May 1, 1991
PubMed
Summary

Eye test phase and examination order impact visual field sensitivity. Repeated testing, especially on the second eye, showed decreased sensitivity over time, affecting both 200 ms and 100 ms stimulus durations.

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Area of Science:

  • Ophthalmology and Vision Science
  • Clinical Psychophysics

Background:

  • Visual field testing is crucial for diagnosing and monitoring optic nerve and retinal diseases.
  • Standardized testing protocols are essential for reliable and reproducible visual field data.
  • Understanding factors influencing visual field test results, such as test phase and eye order, is vital for accurate interpretation.

Purpose of the Study:

  • To investigate the influence of test phase and the order of eye examination on visual field sensitivity.
  • To assess the time-related effects on visual field measurements in normal subjects.

Main Methods:

  • Utilized a customized 30-point central threshold program on the Humphrey Field Analyzer 640.
  • Tested 38 normal subjects across two visits, approximately 2 weeks apart.

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  • Each eye underwent three repetitions (phases) of the testing program within each visit, using both 200 ms and 100 ms stimulus durations.

    • Main Results:

    • Both global and pointwise group mean sensitivity demonstrated a time-related decrease.
    • Deterioration in sensitivity was more pronounced when the second eye was examined compared to the first eye.
    • This effect was observed consistently for both 200 ms and 100 ms stimulus durations.

    Conclusions:

    • The phase of the eye test and the order in which eyes are examined significantly affect visual field sensitivity measurements.
    • Repeated testing within a short interval can lead to a decline in measured sensitivity, particularly in the second eye examined.
    • These findings highlight the importance of considering testing order and repetition effects when interpreting visual field data, especially in clinical settings.