The Influence of Central Corneal Thickness on Intraocular Pressures Measured with Goldmann Applanation Tonometer and Non-contact Tonometer.
- Author:
Gae Rang KWON
1
;
Shin Wook KANG
;
Changwon KEE
Author Information
1. Department of Ophthalmology, Samsung Medical Center, College of Medicine,Sung Kyun Kwan University, Seoul, Korea.
- Publication Type:Original Article
- Keywords:
Central corneal thickness;
Goldmann applanation tonometer;
Intraocular pressure;
Non-contact tonometer
- MeSH:
Humans;
Intraocular Pressure*;
Ultrasonics
- From:Journal of the Korean Ophthalmological Society
1998;39(7):1494-1498
- CountryRepublic of Korea
- Language:Korean
-
Abstract:
It is well documented that increased corneal thickness leads to artificially high estimations of intraocular pressure(IOP) measured with applanation tonometer. To evaluate the influence of central corneal thickness on IOPs measured with non-contact tonometer and Goldmann applanation tonometer and on the IOP discrepancies between two tonometer according to corneal thickness, the IOPs and central corneal thickness of 96 eyes of 48 persons who visited to have their high IOPs evaluated were measured with Goldmann applanation tonometer, non-contact tonometr(CT-50, Topcon, Japan), and corneal pachometer(Humphrey ultrasonic pachometer-850). IOPs measured with each tonometer showed statistically significant linear correlation(p<0.001), IOP rises as the corneal thickness increases(p<0.001), IOPs measured with non-contact tonometer were higher than those measured with Goldmann applanation tonometer(p<0.001), but there were no significant differences between the IOP discrepancies of each tonometer according to corneal thickness, and between the IOP and age in a consistant corneal thickness(p>0.1). In conclusion, the central corneal thickness must be considered in estimating IOP and the IOP differences measured with Goldmann applanation tonometer and non-contact tonometer were not statistifically significantly increased as the corneal thickness increased.
