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Related Experiment Videos

Dynamic contour tonometry: presentation of a new tonometer.

Hartmut E Kanngiesser1, Christoph Kniestedt, Yves C A Robert

  • 1Research and Development, Swiss Microtechnology AG, Port, Switzerland. hartmut.kanngiesser@sisltd.ch

Journal of Glaucoma
|September 9, 2005
PubMed
Summary

A new Dynamic Contour Tonometer directly measures intraocular pressure (IOP) using a pressure-sensitive surface. This innovative tonometer overcomes limitations of existing devices, offering more accurate IOP readings for glaucoma diagnosis.

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Area of Science:

  • Ophthalmology
  • Biomedical Engineering
  • Medical Device Technology

Background:

  • Current tonometers indirectly measure intraocular pressure (IOP) by assessing corneal deformation.
  • Existing methods are susceptible to errors caused by individual variations in corneal properties.

Purpose of the Study:

  • To introduce a novel principle for direct, continuous, and transcorneal IOP measurement.
  • To describe the theoretical basis and evaluate the in vitro application of a new tonometer.

Main Methods:

  • Optimized a pressure-sensitive contact surface on living human eyes.
  • Constructed and validated a Dynamic Contour Tonometer using human cadaver eyes against manometric pressure.

Main Results:

Related Experiment Videos

  • A specific concave contact surface (10.5 mm radius) accurately reflects intraocular pressure.
  • Integrated sensors measured IOP closely to manometric reference pressure.
  • Tonometer accuracy was independent of corneal property variations.

    • Conclusions:

    • Dynamic Contour Tonometry minimizes errors associated with corneal property variations inherent in applanation tonometers.
    • Direct IOP measurement and dynamic pressure registration offer new diagnostic possibilities for glaucoma.
    • This technology advances glaucoma diagnosis and classification by providing true IOP readings.