Plain English Summary
Background and study aims
Glaucoma is an eye condition caused by a build-up of pressure within the eye (the intraocular pressure or IOP). It develops when the fluid in the eye is not able to drain properly. If untreated, it can seriously affect sight and eventually lead to blindness. Here, we want to investigate the effects of the structure and functioning (biomechanical properties) of the cornea (the transparent lens in front of the eye) on IOP measurements taken with two different types of rebound tonometry (the method used to measure IOP),the ICare ocular response analyzer (ORA) and goldmann applanation tonometry (GAT) in patients with glaucoma.
Who can participate?
Adults aged at least 18, with or without glaucoma from the Glaucoma Clinic in the Pusan National University Hospital (South Korea)
What does the study involve?
All participants undergo a ophthalmologic (eye) examination, and then their IOP is measured using the ocular response analyser and goldmann applanation tonometer.
What are the possible benefits and risks of participating?
There will be no direct benefits and risks to those taking part.
Where is the study run from?
Glaucoma clinics in Pusan National University Hospital (South Korea)
Who is funding the study?
Who is the main contact?
Dr Jonghoon Shin, email@example.com
Dr Ji-Woong Lee, firstname.lastname@example.org
Dr Jonghoon Shin
+82 (0) 512407320
The effect of corneal biomechanical properties on rebound tonometer in patients with normal tension glaucoma
The corneal hysteresis is significantly lower and corneal-compensated IOP (IOPcc) is significant higher in normal tension glaucoma (NTG) patient than normal subjects.In addition, applanation tonometer and IOPcc may be greater in NTG than in either normal or high tension glaucoma (HTG) eyes. The null hypothesis is that the relationships between rebound tonometer and IOPcc may be different in NTG eyes with normal eyes.
Pusan National University Hospital, ref. E-2014104
Cross-sectional, comparative study
Primary study design
Secondary study design
Patient information sheet
Not available in web format, please use the contact details below to request a patient information sheet
The participants have underwent the following ophthalmic examinations : slit lamp examination, fundoscopy, automated visual field examination, and IOP measurement with goldmann applanation tonometer, rebound tonometer, and ocular response analyzer
Primary outcome measure
The corneal biomechanical factors on IOP measurements with rebound tonometer, ocular response analyzer, and goldmann applanation tonometer in both NTG patients and normal subjects
Secondary outcome measures
1. Agreements and reliability amongs various IOP measurements in NTG patients and normal subjects
2. Reliability and repeatability between rebound tonometer and other tonometers
Overall trial start date
Overall trial end date
Reason abandoned (if study stopped)
Participant inclusion criteria
1. >18 years of age
2. Clear corneas and clear ocular media
3. Best corrective visual acuity > 20/40
4. Refractive error within ¡À 5.0 diopter of 0, and astigmatism ¡À 3.0D of 0
Target number of participants
Participant exclusion criteria
1. General condition : diabetes
2. Ocular condition : uveitis, secondary glaucoma, corneal abnormalities, nonglaucomatous optic neuropathies, previous trauma, ocular surgery or laser treatment, or any other eye diseases other than glaucoma
Recruitment start date
Recruitment end date
Countries of recruitment
Trial participating centre
Funding Body Type
Funding Body Subtype
Results and Publications
Publication and dissemination plan
Not provided at time of registration
Intention to publish date
Participant level data
Not provided at time of registration
Basic results (scientific)