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Related Experiment Videos

Tono-Pen tonometer and corneal thickness.

K H Mok1, C S Wong, V W Lee

  • 1Queen Mary Hospital Unit, Department of Ophthalmology and Visual Sciences, Chinese University of Hong Kong, China. mokkh@ha.org.hk

Eye (London, England)
|July 9, 1999
PubMed
Summary

The Tono-Pen tonometer accurately measures intraocular pressure (IOP) at both central and mid-peripheral cornea sites. No significant differences were found compared to the Goldmann tonometer, indicating reliable IOP assessment.

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Area of Science:

  • Ophthalmology
  • Optometry
  • Biomedical Engineering

Background:

  • Intraocular pressure (IOP) is a critical metric in diagnosing and managing glaucoma.
  • Accurate IOP measurement is essential for effective patient care.
  • The Tono-Pen tonometer is a portable device for IOP assessment.

Purpose of the Study:

  • To evaluate the Tono-Pen tonometer's accuracy in measuring IOP at the central versus mid-peripheral cornea.
  • To compare Tono-Pen IOP measurements with those obtained using the Goldmann tonometer.
  • To investigate the influence of corneal thickness on IOP readings.

Main Methods:

  • IOP was measured in 48 normal subjects using the Goldmann tonometer and the Tono-Pen at central and mid-peripheral cornea.
  • Ultrasonic pachymetry determined central and mid-peripheral corneal thickness.
  • Statistical analysis compared IOP readings and corneal thicknesses.

Main Results:

  • Mean IOP measurements were comparable across Goldmann, Tono-Pen central, and Tono-Pen mid-peripheral readings.
  • Mid-peripheral corneal thickness was significantly greater than central corneal thickness (578 vs. 538 microns, p < 0.001).
  • No clinically significant differences in IOP were observed between central and mid-peripheral measurements by Tono-Pen.

Conclusions:

  • The Tono-Pen tonometer provides reliable IOP measurements comparable to the Goldmann tonometer.
  • IOP measurements using the Tono-Pen are consistent between central and mid-peripheral cornea.
  • The Tono-Pen is a viable tool for IOP assessment, considering corneal thickness variations.

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