IOP measurement using various tonometries before and after refractive procedure

Poster Details

First Author: T.Kim SOUTH KOREA

Co Author(s):    H. Kim   K. Han   N. Kim   I. Jun   E. Kim  

Abstract Details

Purpose:

To compare the pattern of intraocular pressure (IOP) measurements using noncontact tonometry (NCT), tonopachy (NIDEK, Aichi, Japan), goldmann tonometry (GAT), and dynamic contour tonometry (DCT) in normal or undergone laser assisted subepithelial keratectomy (LASEK) or laser-assisted in situ keratomileusis (LASIK) eyes.

Setting:

Vision Research institute, Dept of Ophthalmology, Yonsei University, Seoul, Korea

Methods:

This cross-sectional, single-center study enrolled 32 eyes without any ocular surgery history, 35 eyes with LASEK, and 29 eyes with LASIK. In all subjects, IOP was measured by four different kinds of tonometers: NCT, tonopachy, GAT, and DCT. And central corneal thickness (CCT) was also measured by tonopachy.

Results:

IOP measured with tonopachy is not significantly different from NCT and GAT in normal eyes. (NCT- tonopachy (p=0.26); NCT-GAT (p=0.11)) IOP measured with DCT is high in all groups. The differences of IOP measurement with NCT and DCT are 7.95 mmHg in normal eyes, 8.51 mmHg in LASEK eyes, and 8.96 mmHg in LASIK eyes. In considering the relation of the IOP measurement with each tonometer and CCT, positive correlation between IOP and CCT in all types of methods after LASEK, however there are significant correlation between two in only NCT and GAT methods after LASIK. IOP change between preoperative and postoperative may be influenced by CCT after refractive surgery. Tonopachy offers corrected IOP using several formulas and we suggest best formula for adjustment of IOP after refractive surgery.

Conclusions:

IOP measured with tonopachy is reliable comparing IOP measured NCT and GAT in normal eyes. IOP measured with DCT tends to be higher than other methods in all subjects. NCT, tonopachy GAT, and DCT tend to be all positively influenced by central corneal thickness in LASEK eyes and LASIK eyes. Based on correcting formula using IOP and CCT measured using tonopachy, we can get reliable adjusted IOP. FINANCIAL DISCLOSURE?: No