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Related Experiment Videos

[2 years self-tonometry. Acceptance and results].

C Deutsch1, J Draeger, S Groenhoff

  • 1Universitäts-Augenklinik, Hamburg.

Der Ophthalmologe : Zeitschrift Der Deutschen Ophthalmologischen Gesellschaft
|December 1, 1992
PubMed
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A new microprocessor-controlled self-tonometer shows clinical promise for measuring intraocular pressure. While accurate, further improvements are planned for user handling and precision.

Area of Science:

  • Ophthalmology
  • Biomedical Engineering

Background:

  • Intraocular pressure (IOP) measurement is crucial for diagnosing and managing glaucoma.
  • Existing tonometers require skilled operators and can be inconvenient.

Purpose of the Study:

  • To evaluate the clinical usefulness and accuracy of a novel microprocessor-controlled self-tonometer.
  • To compare the self-tonometer's performance against a standard hand-held applanation tonometer (HAT).

Main Methods:

  • In vitro calibration using human donor corneas.
  • Patient series comparing two self-tonometer prototypes (A and B) with the Draeger HAT.
  • Each self-tonometer was used three times, followed by a HAT measurement.

Main Results:

  • In vitro calibration yielded good results across the pressure range.

Related Experiment Videos

  • Instrument A showed a correlation coefficient (r) of 0.85 with HAT (SD +/- 1.91 mmHg).
  • Instrument B demonstrated a better correlation (r = 0.904) with similar SD (+/- 1.86 mmHg).
  • Approximately 50% of self-tonometer readings deviated by +/- 1 mmHg from HAT.
  • 75% of patients accepted the new measurement principle.

    • Conclusions:

    • The microprocessor-controlled self-tonometer demonstrates potential clinical utility for IOP measurement.
    • The device shows good correlation with the established HAT, with room for improvement in accuracy and precision.
    • Further design enhancements are planned to optimize user handling and measurement performance.