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

Glaucoma Clinical Trial

Official title:

Comparison of Intraocular Pressure Measured by Goldmann Applanation Tonometry and Dynamic Contour Tonometry vs. Corvis ST Tonometer

Clinical Trial Details — Status: Completed

Administrative data

• NCT number: NCT02624427
• Other study ID #: Corvis and DCT vs. GAT
• Status: Completed
• Phase: N/A
• First received: November 27, 2015
• Last updated: June 20, 2017
• Start date: December 2015
• Est. completion date: November 2016

Study information

• Verified date: June 2017
• Source: University of Zurich
• Contact: n/a
• Is FDA regulated: No
• Study type: Interventional

Clinical Trial Summary

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

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.

Recruitment information / eligibility

• Status: Completed
• Enrollment: 109
• Est. completion date: November 2016
• Est. primary completion date: August 2016
• Accepts healthy volunteers: Accepts Healthy Volunteers
• Gender: All
• Age group: 18 Years and older

Eligibility

Inclusion Criteria for the glaucoma group:

• diagnosis of glaucoma

• 18 years old or older with no upper limit

Exclusion Criteria for the glaucoma group:

• IOP lowering surgery within the last 3 weeks

• any corneal surgery in the past

• bad fixation

• insufficient measurement quality with any of the study devices

Inclusion Criteria for the healthy control group:

• no diagnosis of glaucoma

• 18 years old or older with no upper limit

Exclusion Criteria for the healthy control group:

• any diagnosis of glaucoma

• IOP lowering surgery within the last 3 weeks

• any corneal surgery in the past

• bad fixation

• insufficient measurement quality with any of the study devices

Related Conditions & MeSH terms

• Glaucoma

Intervention

Device:
• Measurement of intraocular pressure (IOP)
Measurement of IOP with the following devices: (1) Goldmann tonometer, (2) Dynamic Contour tonometer, and (3) Corvis ST tonometer

Locations

Country	Name	City	State
n/a

Sponsors (1)

Lead Sponsor	Collaborator
University of Zurich

Outcome

Type	Measure	Description	Time frame	Safety issue
Primary	Delta IOP	IOP difference of Goldmann tonometer and Dynamic Contour tonometer	baseline
Secondary	Correlation of IOP difference of Goldmann tonometer and Dynamic Contour tonometer with biomechanical corneal properties measured by Corvis ST tonometer	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).	baseline

External Links

•   Study Center