Effect of laser in situ keratomileusis on rebound tonometry and Goldmann applanation tonometry.
OBJECTIVE
To determine the influence of refractive surgery on intraocular pressure (IOP) measurements obtained using an iCare rebound tonometer and a Goldmann applanation tonometer.


METHODS
School of Optometry, Hong Kong Polytechnic University, Hong Kong, China.


METHODS
Intraocular pressure was measured using the rebound tonometer and applanation tonometer before and 1 month after uneventful LASIK for myopia.


RESULTS
The IOP was measured in 96 eyes (96 patients). The preoperative IOP measured by rebound tonometry (mean 16.7 mm Hg +/- 3.0 [SD]) was statistically significantly higher than by Goldmann applanation tonometry (mean 15.4 +/- 2.5 mm Hg) (P<.01, Wilcoxon test). There was no statistically significantly difference in postoperative measurements between the 2 tonometers (mean 11.9 +/- 2.6 mm Hg and 12.0 +/- 2.4 mm Hg, respectively) (P>.05, Wilcoxon test). The mean difference between the 2 tonometers after LASIK was 0.1 +/- 2.1 mm Hg. The 95% limits of agreement ranged from -4.26 to 4.05 mm Hg. The IOP reduction with rebound tonometry was positively correlated with preoperative IOP.


CONCLUSIONS
There was a greater decrease in IOP measurement after LASIK by rebound tonometry, showing this method was more affected by surgery.
Lam
Andrew K C
AK
School of Optometry, Hong Kong Polytechnic University, Hong Kong, China. sokclam@polyu.edu.hk
Wu
Ricky
R
Wang
Zheng
Z
Woo
Victor
V
Chan
Elice
E
Tam
Kenny
K
Chau
Ricky
R
Wong
Kin-Keung
KK
D000328:Adult; D005260:Female; D006801:Humans; D007429:Intraocular Pressure / Q000502:physiology*; D020731:Keratomileusis, Laser In Situ; D054018:Lasers, Excimer / Q000627:therapeutic use*; D008297:Male; D008875:Middle Aged; D009216:Myopia / Q000503:physiopathology / Q000601:surgery*; D011446:Prospective Studies; D015203:Reproducibility of Results; D014065:Tonometry, Ocular / Q000295:instrumentation*; D055815:Young Adult