Goldmann Applanation Tonometry, Dynamic Contour Tonometry, and Corvis ST Tonometer

Not Applicable

Completed

• Conditions: Glaucoma
• Interventions: Device: Measurement of intraocular pressure (IOP)

• Registration Number: NCT02624427
• Lead Sponsor: University of Zurich

Brief Summary

The study is investigating Intra ocular pressure (IOP) by Goldmann Applanation Tonometry, Dynamic Contour Tonometry, and the Corvis ST tonometer.

Detailed Description

The aim of the study is to approach the "true" Intra ocular pressure (IOP) by correlating the difference between IOP by Goldmann Applanation Tonometry to the IOP by Dynamic Contour Tonometry to the biomechanical parameters of the cornea measured by Corvis ST. Therefore the investigators gain new findings about the influence of the biomechanical corneal parameters on the IOP. In order to do so the investigators want to examine 50 Glaucoma eyes and 50 non-Glaucoma Eyes with Goldmann Applanation Tonometry, Dynamic Contour Tonometry, and Corvis ST.

Study Timeline

• Study First Submitted: 2015-11-27
• Study Start: 2015-12
• Study First Submitted QC: 2015-12-07
• Study First Posted: 2015-12-08
• Primary Completion: 2016-08
• Study Completion: 2016-11
• Status Verified: 2017-06
• Last Update Submitted: 2017-06-20
• Last Update Posted: 2017-06-21

Recruitment & Eligibility

• Status: COMPLETED
• Sex: All
• Target Recruitment: 109

Inclusion Criteria

Not provided

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Exclusion Criteria

Not provided

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Study & Design

• Study Type: INTERVENTIONAL
• Study Design: PARALLEL

Arm && Interventions

Group	Intervention	Description
Glaucoma Eyes	Measurement of intraocular pressure (IOP)	Measurement of intraocular pressure (IOP)
Healthy Eyes	Measurement of intraocular pressure (IOP)	age-matched healthy eyes as controls will undergo Measurement of intraocular pressure (IOP)

Primary Outcome Measures

Name	Time	Method
Delta IOP	baseline	IOP difference of Goldmann tonometer and Dynamic Contour tonometer

Secondary Outcome Measures

Name	Time	Method
Correlation of IOP difference of Goldmann tonometer and Dynamic Contour tonometer with biomechanical corneal properties measured by Corvis ST tonometer	baseline	Corvis ST has an integrated high-speed Scheimpflug camera which records images on which basis the biomechanical corneal parameter are analyzed (corneal thickness in micrometers, corneal applications in millimeters, peak distance in millimeters, radius in millimeters, and deformation amplitude in millimeters). Those biomechanical parameters of the cornea will be correlated to the difference of the IOP measured by GAT and by DCT (GAT - DCT).