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Comparison of Different Portable Tonometers (Icare Pro, TONO-Pen AVIA, Perkins Tonometer, PASCAL Hand Held Dynamic Contour Tonometer)

This study is enrolling participants by invitation only.
Information provided by (Responsible Party):
University of Zurich Identifier:
First received: March 14, 2011
Last updated: January 5, 2015
Last verified: December 2014

In different cases intraocular pressure (IOP) have to measured in lying position. Therefore a lot of portable tonometers have been established. The Icare Pro is a new tonometer on the market that allows faster and more comfortable IOP-measurements. No local anesthesia is needed, what is a major advantage for the patients. In this study the investigators want to evaluate if IOP measurements with Icare Pro Tonometer are as reliable as they are with other established portable tonometers (Perkins, TONO-Pen and hand held-Dynamic Contour Tonometer).

  • Trial with medical device

Condition Intervention Phase
Healthy Participants
Device: measurement of intraocular pressure
Phase 4

Study Type: Interventional
Study Design: Allocation: Non-Randomized
Endpoint Classification: Efficacy Study
Intervention Model: Single Group Assignment
Masking: Open Label
Primary Purpose: Diagnostic

Further study details as provided by University of Zurich:

Primary Outcome Measures:
  • intraocular pressure [ Time Frame: Study Visit 1 ] [ Designated as safety issue: No ]
    the intraocular pressure will be measured at the first and only study visit (Visit 1, day 0)

Estimated Enrollment: 25
Study Start Date: March 2011
Estimated Study Completion Date: December 2015
Estimated Primary Completion Date: December 2015 (Final data collection date for primary outcome measure)
Arms Assigned Interventions
Study group
Study group
Device: measurement of intraocular pressure
Intraocular pressure will be measured with the following devices (each 2 times)at the first and only study visit
Other Names:
  • Icare Pro (Icare Finland Oy, Espoo, Finland)
  • TONO-Pen AVIA (Reichert Terchnologies Inc., Depew, NY; USA
  • Perkins Tonometer (Haag-Streit AG, Könitz, Switzerland)
  • PASCAL hand helt-Dynamic Contour Tonometer (Ziemer Ophthalmic Systems AG, Port, Switzerland)


Ages Eligible for Study:   18 Years and older   (Adult, Senior)
Genders Eligible for Study:   All
Accepts Healthy Volunteers:   No

Inclusion criteria:

  • healthy patients of at least 18 years of age or above

Exclusion criteria:

  • diagnosis of glaucoma or other optic neuropathies
  • corneal disorder that make IOP measurement impossible
  Contacts and Locations
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Please refer to this study by its identifier: NCT01325324

University Hospital Zurich, Ophthalmic Clinic
Zurich, ZH, Switzerland, 8091
Sponsors and Collaborators
University of Zurich
Principal Investigator: Jens Funk, Prof. MD University Hospital Zurich, Ophtalmic Clinic
  More Information

Publications automatically indexed to this study by Identifier (NCT Number):
Responsible Party: University of Zurich Identifier: NCT01325324     History of Changes
Other Study ID Numbers: portable-Tono-Study 
Study First Received: March 14, 2011
Last Updated: January 5, 2015
Health Authority: Switzerland: Swissmedic processed this record on January 14, 2017