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

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

Status

Completed

Phases

Study type

Interventional

Source

ClinicalTrials.gov

Registry ID

NCT02624427

Enrollment

109

Registered

2015-12-08

Start date

2015-12-31

Completion date

2016-11-30

Last updated

2017-06-21

For informational purposes only — not medical advice. Sourced from public registries and may not reflect the latest updates. Terms

Conditions

Glaucoma

Keywords

Glaucoma, Intraocular Pressure

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.

Interventions

DEVICEMeasurement of intraocular pressure (IOP)

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

Study design

Allocation

NON_RANDOMIZED

Intervention model

PARALLEL

Primary purpose

DIAGNOSTIC

Masking

NONE

Eligibility

Sex/Gender

ALL

Age

18 Years to No maximum

Healthy volunteers

Yes

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

Design outcomes

Primary

Measure	Time frame	Description
Delta IOP	baseline	IOP difference of Goldmann tonometer and Dynamic Contour tonometer

Secondary

Measure	Time frame	Description
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).

Outcome results

None listed

Source: ClinicalTrials.gov · Data processed: Feb 4, 2026