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Related Experiment Videos

Principles of contact lens tonometry.

P W Dekker1, Y C Robert, H Kanngiesser

  • 1University Eye Department, Universitätsspital, Zurich, Switzerland.

International Ophthalmology
|September 3, 1999
PubMed
Summary

This study introduces a novel contact lens with integrated pressure sensing for accurate intraocular pressure (IOP) measurement. The device precisely measures IOP independent of appositional force, enhancing glaucoma diagnostics.

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Area of Science:

  • Ophthalmology
  • Biomedical Engineering
  • Medical Devices

Background:

  • Accurate intraocular pressure (IOP) measurement is crucial for diagnosing and managing glaucoma.
  • Current methods can be influenced by the force applied during measurement (appositional force).
  • A need exists for a device that can measure IOP independently of appositional force.

Purpose of the Study:

  • To develop and evaluate a contact lens with an integrated pressure-sensing device.
  • To assess the device's ability to measure IOP independent of appositional force (p0).
  • To investigate continuous IOP monitoring and IOP variations related to appositional force.

Main Methods:

  • Construction of a contact lens with a three-point force-sensing element system.

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  • Precision testing against a manometric transducer using eye bank eyes.
  • Examination of IOP as a function of appositional force and development of a measurement procedure for baseline eye pressure (p0).

    • Main Results:

    • The contact lens device demonstrated precision in measuring appositional force.
    • The study established a method for measuring baseline eye pressure (p0) independent of appositional force.
    • The device allows for continuous IOP monitoring and assessment of IOP dependency on appositional force.

    Conclusions:

    • The developed contact lens offers a promising new method for accurate IOP measurement.
    • This technology has the potential to improve glaucoma diagnosis and patient management.
    • The device enables differentiation between pressure-independent and pressure-dependent IOP measurements.