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Related Experiment Videos

Repeatability and effects of sequential measurements with POBF tonograph.

Pinakin Gunvant1, Russell Julian Watkins, David Charles Broadway

  • 1Department of Psychological and Brain Sciences, University of Louisville, Louisville, Kentucky 40292, USA. contact@pinakin-gunvant.com

Optometry and Vision Science : Official Publication of the American Academy of Optometry
|November 24, 2004
PubMed
Summary

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Repeated intraocular pressure (IOP) measurements with the Pulsatile Ocular Blood Flow (POBF) Tonograph show a decrease, especially with shorter intervals. For accurate IOP readings, allow at least 2-15 minutes between POBF Tonograph measurements.

Area of Science:

  • Ophthalmology
  • Biomedical Engineering
  • Medical Instrumentation

Background:

  • Intraocular pressure (IOP) is a critical factor in diagnosing and managing glaucoma.
  • Accurate and repeatable IOP measurements are essential for effective patient care.
  • The Pulsatile Ocular Blood Flow (POBF) Tonograph is a device used for measuring IOP and ocular blood flow.

Purpose of the Study:

  • To evaluate the impact of sequential measurements using the POBF Tonograph on IOP and POBF readings.
  • To determine if measuring the fellow eye affects IOP.
  • To assess the repeatability of measurements obtained with the POBF Tonograph.

Main Methods:

  • 46 healthy adults participated in the study.
  • Subjects underwent sequential POBF Tonograph measurements with varying time intervals (1-15 minutes).

Related Experiment Videos

  • Repeatability was assessed using intraclass correlation coefficient and Bland-Altman plots.

    • Main Results:

    • Repeated IOP measurements showed a significant decrease, particularly with shorter intervals (1 minute).
    • No significant changes were observed in POBF values across repeated measurements.
    • Single measurements on the fellow eye did not significantly alter IOP.

    Conclusions:

    • For reliable IOP measurements with the POBF Tonograph, a minimum interval of 2 minutes, preferably 15 minutes, is recommended between sequential readings.
    • The POBF Tonograph demonstrated no significant immediate effect on IOP or POBF values of the fellow eye.