Intraocular Pressure
Conditions
Keywords
Intraocular pressure, Goldmann tonometry, applanation tonometry, Tonometry, Ocular
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).
Interventions
DEVICETonometry
Tonometry : measurement of intraocular pressure with an applanation tonometer
Sponsors
Haag-Streit AG
Insel Gruppe AG, University Hospital Bern
Study design
Allocation
RANDOMIZED
Intervention model
SINGLE_GROUP
Primary purpose
DIAGNOSTIC
Masking
NONE
Eligibility
Sex/Gender
ALL
Age
18 Years to 80 Years
Healthy volunteers
Yes
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)
Design outcomes
Primary
| Measure | Time frame |
|---|---|
| Intraocular Pressure in mmHG | single event |
Secondary
| Measure | Time frame |
|---|---|
| safety of measurement | single event, up to one week post measurement |
Countries
Switzerland
Outcome results
None listed