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Related Experiment Videos

New device for artificial increasing intraocular pressure

P R Preussner1, A Duran

  • 1Universitäts-Augenklinik, Mainz, Germany.

Graefe'S Archive for Clinical and Experimental Ophthalmology = Albrecht Von Graefes Archiv Fur Klinische Und Experimentelle Ophthalmologie
|November 1, 1996
PubMed
Summary
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A new mechanical device safely and comfortably increases intraocular pressure for diagnostic testing, minimizing induced astigmatism. This offers a more reliable method for glaucoma diagnostics and other eye investigations.

Area of Science:

  • Ophthalmology
  • Medical Devices
  • Diagnostic Tools

Background:

  • Intraocular pressure (IOP) elevation is crucial for specific eye investigations, particularly in glaucoma diagnostics.
  • Current methods, like suction cup apparatus, are uncomfortable, risky, and induce significant astigmatism, potentially affecting results.

Purpose of the Study:

  • To develop and evaluate a novel, simple mechanical device for controlled intraocular pressure elevation.
  • To assess the device's ease of use, patient comfort, and impact on induced astigmatism.

Main Methods:

  • A mechanical device using weights on a lever to compress the eye through the eyelids was designed and tested.
  • The device was mounted on standard ophthalmological equipment and tested on healthy volunteers and patients with Graves' disease, high myopia, and open-angle glaucoma.

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Main Results:

  • The device reliably elevated intraocular pressure across all tested groups.
  • Patients with exophthalmos (Graves' disease) showed a slightly higher pressure elevation effect.
  • Induced astigmatism was minimal, approximately 0.5 diopters for a 20 mmHg pressure increase.

Conclusions:

  • The new device is user-friendly and comfortable for patients.
  • It provides reproducible intraocular pressure elevations suitable for diagnostic purposes.
  • Individual calibration is recommended for studies requiring very high accuracy in pressure values.