Influence of Discordant Intraocular Eye Pressure Readings Taken by Dynamic Contour Tonometry and Goldmann Applanation Tonometry

The recruitment status of this study is unknown because the information has not been verified recently.
Verified November 2011 by University of Zurich.
Recruitment status was  Active, not recruiting
Information provided by (Responsible Party):
University of Zurich Identifier:
First received: November 3, 2011
Last updated: November 14, 2011
Last verified: November 2011

IOP is measured with two devices (Dynamic Contour Tonometry (DCT) and Goldmann applanation tonometry (GAT)). DCT reading will be compared to a corrected GAT reading by the formula of Elsheikh, Alhasso and Pye.

  • Trial with medical device

Condition Intervention Phase
Device: Intraocular Pressure Measurement
Phase 4

Study Type: Observational
Study Design: Observational Model: Cohort
Time Perspective: Prospective

Resource links provided by NLM:

Further study details as provided by University of Zurich:

Primary Outcome Measures:
  • Intraocular pressure (IOP) [ Time Frame: IOP is measured at the only study visit ] [ Designated as safety issue: No ]
    IOP is measured with goldman-applanation tonometer and dynamic-contour-tonometer at the only study visit (V0)

Secondary Outcome Measures:
  • Demographical and clinical data [ Time Frame: study visit V0 ] [ Designated as safety issue: No ]
    Age, axial length of the eye, central corneal thickness

Estimated Enrollment: 102
Study Start Date: November 2011
Estimated Primary Completion Date: December 2012 (Final data collection date for primary outcome measure)
Intervention Details:
    Device: Intraocular Pressure Measurement
    Intraocular pressure is messured with goldmann applanation tonometer (GAT) and with the dynamic contour tonometer (DCT)
    Other Names:
    • GAT: Haag-Streit AG, Gartenstadtstrasse 10, 3098 Koeniz, Switzerland
    • DCT: Ziemer Ophthalmic Systems AG, Allmendstrasse 11, 2562 Port, Switzerland

Ages Eligible for Study:   18 Years and older
Genders Eligible for Study:   Both
Accepts Healthy Volunteers:   No
Sampling Method:   Non-Probability Sample
Study Population
glaucoma patients

Inclusion criteria:

  • clinical diagnosis of glaucoma

Exclusion criteria:

  • other optic neuropathy other then glaucoma
  • age<18
  • corneal surgery
  • use of contact lenses
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Please refer to this study by its identifier: NCT01474070

University Hospital Zurich, Ophthalmic Clinic
Zurich, ZH, Switzerland, 8091
Sponsors and Collaborators
University of Zurich
Principal Investigator: Christoph Kniestedt, Ass. Prof., MD University Hospital Zurich, Ophthalmic Clinic
  More Information

Responsible Party: University of Zurich Identifier: NCT01474070     History of Changes
Other Study ID Numbers: GAT-DCT-Vergleich 
Study First Received: November 3, 2011
Last Updated: November 14, 2011
Health Authority: Switzerland: Swissmedic processed this record on May 26, 2016