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Miscellaneous (19)

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Abstract #26169 Published in IGR 12-2

Effect of laser in situ keratomileusis on rebound tonometry and Goldmann applanation tonometry

Lam AK; Wu R; Wang Z; Woo V; Chan E; Tam K; Chau R; Wong KK
Journal of Cataract and Refractive Surgery 2010; 36: 631-636

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PURPOSE: To determine the influence of refractive surgery on intraocular pressure (IOP) measurements obtained using an iCare rebound tonometer and a Goldmann applanation tonometer. SETTING: 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. CONCLUSION: There was a greater decrease in IOP measurement after LASIK by rebound tonometry, showing this method was more affected by surgery.

School of Optometry, Hong Kong Polytechnic University, Hong Kong, China. sokclam@polyu.edu.hk

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Classification:

8.4 Refractive surgical procedures (Part of: 8 Refractive errors in relation to glaucoma)
6.1.1 Devices, techniques (Part of: 6 Clinical examination methods > 6.1 Intraocular pressure measurement; factors affecting IOP)

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