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GAT-DCT-Discordance Due to Corneal Properties

This study has been completed.
Information provided by (Responsible Party):
University of Zurich Identifier:
First received: November 3, 2011
Last updated: October 17, 2016
Last verified: October 2016
IOP is measured with two devices (Dynamic Contour Tonometry (DCT) and Goldmann applanation tonometry (GAT)).

Condition Intervention Phase
Device: Intraocular Pressure Measurement
Phase 4

Study Type: Observational
Study Design: Observational Model: Cohort
Time Perspective: Prospective
Official Title: Influence of Discordant Intraocular Eye Pressure Readings Taken by Dynamic Contour Tonometry and Goldmann Applanation Tonometry

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

Enrollment: 112
Study Start Date: November 2011
Study Completion Date: October 2016
Primary Completion Date: September 2016 (Final data collection date for primary outcome measure)
Intervention Details:
    Device: Intraocular Pressure Measurement
    Intraocular pressure is measured with GAT and with DCT
    Other Names:
    • Goldmann Applanation Tonometry (GAT)
    • Dynamic Contour Tonometry (DCT)
Detailed Description:

DCT reading will be compared to a corrected GAT reading by the formula of Elsheikh, Alhasso and Pye.

  • Trial with medical device

Ages Eligible for Study:   18 Years and older   (Adult, Senior)
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
  Contacts and Locations
Choosing to participate in a study is an important personal decision. Talk with your doctor and family members or friends about deciding to join a study. To learn more about this study, you or your doctor may contact the study research staff using the Contacts provided below. For general information, see Learn About Clinical Studies.

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, 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: October 17, 2016
Health Authority: Switzerland: Swissmedic
Individual Participant Data  
Plan to Share IPD: No

Keywords provided by University of Zurich:
Goldmann Tonometry
Dynamic Contour Tonometry

Additional relevant MeSH terms:
Ocular Hypertension
Eye Diseases processed this record on October 21, 2016