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

University of Zurich (UZH)

Status: Completed

Conditions: Glaucoma

Treatments: Device: Measurement of intraocular pressure (IOP)

Study type: Interventional

Funder types: Other

Identifiers

NCT02624427

Corvis and DCT vs. GAT

Details and patient eligibility

About

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

Full 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.

Enrollment: 109 patients

Sex: All

Ages: 18+ years old

Volunteers: Accepts Healthy Volunteers

Inclusion and exclusion criteria

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

Trial design

Primary purpose: Diagnostic

Allocation: Non-Randomized

Interventional model: Parallel Assignment

Masking: None (Open label)

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109 participants in 2 patient groups

Glaucoma Eyes

Experimental group

Description:

Measurement of intraocular pressure (IOP)

Treatment:

Device: Measurement of intraocular pressure (IOP)

Healthy Eyes

Active Comparator group

Description:

age-matched healthy eyes as controls will undergo Measurement of intraocular pressure (IOP)

Treatment:

Device: Measurement of intraocular pressure (IOP)