Clinical Trial: The Intraocular Pressure Measured by Different Tonometers in Corneal Edema

Study Status: Recruiting
Recruit Status: Recruiting
Study Type: Observational

Official Title: The Variation of the Intraocular Pressure Measured by Different Tonometers in Patients With Clinical Corneal Edema

Brief Summary: The investigators conduct this study to access the effect of corneal edema (the investigators are particularly interested in those who have the clinical central corneal edema) on the variation of intraocular pressure values measured by 3 commercial-available tonometers compare to the current gold standard tonometer; Goldmann applanation tonometer.

Detailed Summary: Previous published articles reported on the effect of corneal edema on the accuracy of tonometry were performed in enucleated cadaver eyes, or contact lens-induced corneal edema eyes. Thus, it remains unclear as to how the clinical corneal edema that is found in routine clinical practice will affect the variation of intraocular pressure measurement using the standard Goldmann applanation tonometer and other more modern tonometers such as the dynamic contour tonometer, the iCare, and the Tonopen.
Sponsor: Prince of Songkla University

Current Primary Outcome: Intraocular pressure [ Time Frame: A day after cataract surgery and when the corneal edema is resolve (usually within 1-2 weeks post operatively) ]

The intraocular pressure measured by each tonometer compare with Goldmann applanation tonometer (When measure in eyes with corneal edema and when the edema is clinically resolve)


Original Primary Outcome: Same as current

Current Secondary Outcome: Relationship between the central corneal thickness and intraocular pressure measured by each tonometer [ Time Frame: A day after surgery (clinical corneal edema was detected) and within 1-2 weeks (resolution of edema) ]

The severity of corneal edema may affect the reliability of intraocular pressure measurement measured by different tonometers


Original Secondary Outcome: Same as current

Information By: Prince of Songkla University

Dates:
Date Received: November 23, 2013
Date Started: November 2013
Date Completion: October 2016
Last Updated: August 8, 2016
Last Verified: August 2016