Assessment of a New Goldmann Applanation Tonometer

Study Overview
=================
Brief Summary
-----------------
The classic Goldmann applanation tonometer has been further developed. The applanation principle has been retained, while the internal force transmission and the pressure gauging have been optimized, and the display of results digitized. The purpose of the study is to compare the standard Goldmann applanation tonometer AT900 with the new version of the device, and to test the reliability and reproducibility of measurements, as well as its safety.

Detailed Description
-----------------
The classic Goldmann applanation tonometer has been further developed. The applanation principle has been retained, while the internal force transmission and the pressure gauging have been optimized, and the display of results digitized. The purpose of the study is to compare the standard Goldmann applanation tonometer AT900 with the new version of the device, and to test the reliability and reproducibility of measurements, as well as its safety. Patients at the Department of Ophthalmology, University of Bern, will be included after informed consent. The study has been approved by the local ethical committee. Routine ophthalmologic examination will be performed and inclusion criteria evaluated. Measurements will be taken with the two tonometers in random order. Prior to pressure measurement, central corneal thickness will be measured with a non-contact method (Optical Low Coherence Reflectometry, OLCR pachymeter, Haag-Streit, Koeniz, Switzerland).

Official Title
-----------------
Assessment of a New Goldmann Applanation Tonometer

Conditions
-----------------
Intraocular Pressure

Intervention / Treatment
-----------------
* Device: Tonometry


Participation Criteria
=================
Eligibility Criteria
-----------------
Inclusion Criteria: patient willing to participate and signed informed consent Exclusion Criteria: patient under 18 y of age patient pregnant not steady fixation, nystagm corneal scars or corneal disease astigmatism higher than 2.5 diopters corneal surgery in the past microphthalmos or buphthalmos contact lens wear dry eye syndrome blepharospasm active inflammation of conjunctiva, cornea or uvea known allergy to topical oxybuprocain for topical anaesthesia known allergy to fluorescein solution (used for applanation tonometry)

Ages Eligible for Study
-----------------
Minimum Age: 18 Years
Maximum Age: 80 Years

Sexes Eligible for Study
-----------------
All

Accepts Healthy Volunteers
-----------------
Accepts Healthy Volunteers

Study Plan
=================
How is the study designed?
-----------------

Design Details

Primary Purpose: Diagnostic
Allocation: Randomized
Intervention Model: Single Group Assignment
Masking: None (Open Label)


Arms and Interventions

| Participant Group/Arm | Intervention/Treatment |
| --- | --- |
| Active Comparator: 1<br> | Device: Tonometry<br>* Tonometry : measurement of intraocular pressure with an applanation tonometer<br>|

What is the study measuring?
-----------------
Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Intraocular Pressure in mmHG |  | single event | 

Secondary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| safety of measurement |  | single event, up to one week post measurement | 

 Terms related to the study
=================
Keywords Provided by Centre Hospitalier Valida
-----------------
Intraocular pressure, Goldmann tonometry, applanation tonometry, Tonometry, Ocular