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Related Experiment Videos

Tono-Pen, a new tonometer.

V Hessemer1, R Rössler, K W Jacobi

  • 1University Eye Clinic, Justus Liebig University Giessen, FRG.

International Ophthalmology
|January 1, 1989
PubMed
Summary

The Tono-Pen accurately measured intraocular pressure (IOP) in cadaver eyes but showed significant deviations from Goldmann tonometry in healthy subjects at high IOP levels.

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Area of Science:

  • Ophthalmology
  • Biomedical Engineering

Background:

  • Intraocular pressure (IOP) measurement is crucial for diagnosing and managing glaucoma.
  • The Tono-Pen is a portable electronic tonometer designed for IOP assessment.

Purpose of the Study:

  • To evaluate the accuracy of the Tono-Pen compared to Goldmann tonometry in healthy subjects.
  • To assess the Tono-Pen's performance against a manometer in human cadaver eyes.

Main Methods:

  • Study 1: Compared Tono-Pen with Goldmann tonometry in 108 healthy subjects (216 eyes), with IOP manipulated.
  • Study 2: Compared Tono-Pen with a Statham manometer in 6 human cadaver eyes (12 eyes), with IOP manipulated.

Main Results:

  • Tono-Pen slightly overestimated low IOP (<16 mmHg) and underestimated high IOP (>16 mmHg) compared to Goldmann.
  • Tono-Pen showed acceptable agreement with manometer readings across a wide IOP range in cadaver eyes.

Conclusions:

  • Tono-Pen demonstrated acceptable IOP measurement in cadaver eyes but requires modification for high IOP ranges in clinical settings.
  • Further Tono-Pen modifications are needed for accurate high IOP assessment in live subjects.

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