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Related Experiment Videos

Microprocessor controlled tonometry.

J Draeger1, E Rumberger, J Dauper

  • 1Hamburg University, Eye Department, West Germany.

Eye (London, England)
|January 1, 1989
PubMed
Summary
This summary is machine-generated.

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New microprocessor-controlled tonometers show good correlation with established methods for measuring intraocular pressure. However, these advanced devices do not match the precision of the classical Goldmann applanation tonometer.

Area of Science:

  • Ophthalmology
  • Biomedical Engineering
  • Medical Instrumentation

Background:

  • Microprocessor technology has advanced the design of ophthalmic instruments.
  • Tonometry, the measurement of intraocular pressure (IOP), is crucial for diagnosing and managing glaucoma.
  • New microprocessor-controlled tonometers offer potential improvements in IOP measurement.

Purpose of the Study:

  • To evaluate the performance of three new microprocessor-controlled tonometers: Tono-Pen (Mackay-Marg principle), Pulsair, and CT-10 (non-contact airstream).
  • To compare the accuracy and precision of these new devices against established Goldmann and Hand Held Applanation Tonometers (HAT).

Main Methods:

  • Comparison of IOP readings from Tono-Pen, Pulsair, and CT-10 against Goldmann and Draeger-HAT reference tonometers.

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  • Analysis of correlation coefficients (r) and standard deviations (s) to assess agreement between instruments.
  • Evaluation of measurement precision through repeated readings with each tonometer.

    • Main Results:

    • All three microprocessor-controlled tonometers demonstrated good correlation with the Hand Held Applanation Tonometer (HAT) (r values ranging from 0.84 to 0.90).
    • The non-contact tonometers (Pulsair and CT-10) utilize a conically formed airstream to applanate the cornea.
    • Despite good correlation, the new tonometers exhibited higher standard deviations in repeated measurements compared to the classical applanation tonometer, indicating lower precision.

    Conclusions:

    • Microprocessor-controlled tonometers, including Tono-Pen, Pulsair, and CT-10, offer reliable IOP measurements with good agreement to established methods.
    • These new instruments are capable of measuring IOP across a wide range.
    • The precision of the evaluated microprocessor-controlled tonometers is not equivalent to that of the classical applanation tonometer.