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Completed

NCT Number: NCT02624427

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

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

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Key information

Conditions

Glaucoma Eye Diseases Ocular Hypertension

Age range

18 year and older

Sex eligibility

All sexes

Study type

Interventional

Phase

Not applicable

About this study

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.

Who can participate

Healthy volunteers accepted: Yes

Only the study team can determine whether someone qualifies for participation.

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

Treatment and study plan

Measurement of intraocular pressure (IOP)

Device

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

Primary outcomes

  1. Delta IOP

    Time frame: baseline

    IOP difference of Goldmann tonometer and Dynamic Contour tonometer

Secondary outcomes

  1. Correlation of IOP difference of Goldmann tonometer and Dynamic Contour tonometer with biomechanical corneal properties measured by Corvis ST tonometer

    Time frame: 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).

Sponsors and collaborators

Lead sponsor

University of Zurich

Other

Registry information

Official study title

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

Important dates

Study start
2015
Primary completion
2016
Study completion
2016
First posted
Dec 8, 2015
Registry last updated
Jun 21, 2017

OpenTrials presents study information sourced from ClinicalTrials.gov. The official registry record should be consulted for the latest information.

View the official ClinicalTrials.gov record (opens in a new tab)

This listing is for discovery and informational purposes only. It is not medical advice, does not guarantee that a study is recruiting, and does not determine eligibility. Contact the study team and a qualified healthcare professional when considering participation.

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