Comparison between dynamic contour tonometry and Goldmann applanation tonometry.
OBJECTIVE
To compare the intraocular pressures (IOPs) measured by dynamic contour tonometry (DCT) and Goldmann applanation tonometry (GAT), and to investigate the association of IOPs on eyes of varying central corneal thickness (CCT).


METHODS
In this prospective study, 451 eyes of 233 subjects were enrolled. IOPs were measured by GAT and DCT. CCT was measured three times and the average was calculated. Each eye was classified into one of three groups according to CCT: low CCT (group A, CCT<520 microm, n=146); normal CCT (group B, 520 microm<or=CT<or=550 microm, n=163); and high CCT (group C, CCT>550 microm, n=142). In each group, we investigated the association of CCT with IOP measurement by GAT and DCT.


RESULTS
The IOPs measured by GAT and DCT were significantly associated for all eyes (R=0.853, p<0.001, Pearson correlation). CCT was related with both IOP measurement by GAT and DCT with statistical significance (mixed effect model, p<0.001). However, subgroup analysis showed that CCT affected IOP measured by GAT for groups B and C, whereas it affected IOP measured by DCT only for group C.


CONCLUSIONS
IOP measured by DCT was not affected by CCT in eyes with low to normal CCT, whereas this measurement was affected in eyes of high CCT range. CCT may have less effect on IOP measurements using DCT than those obtained by GAT, within a specified range of CCT.
Lee
Jooeun
J
Department of Ophthalmology, College of Medicine, University of Ulsan, Asan Medical Center, Seoul, Korea.
Lee
Chang Hwan
CH
Choi
Jaewan
J
Yoon
Sam Young
SY
Sung
Kyung Rim
KR
Park
Seong Bae
SB
Kook
Michael S
MS