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S Naruse, K Mori, M Kojo, O Hieda, S Kinoshita; Evaluation Of Intraocular Pressure Change After Laser In Situ Keratomileusis Using Pressure Phosphene Tonometer . Invest. Ophthalmol. Vis. Sci. 2002;43(13):2114.
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© ARVO (1962-2015); The Authors (2016-present)
Purpose: After laser in situ keratomileusis (LASIK), tonometric readings of intraocular pressure (IOP) using applanation tonometry are known to be underestimated due to corneal thickness changes. The pressure phosphene tonometer (FPT), first reported by Fresco in 1998, enables patients to measure IOP by themselves through the upper eyelid without touching the cornea, making use of the pressure phosphene phenomenon. The aim of this study is to evaluate IOP change after LASIK, using FPT. Methods: Twenty-two patients (36 eyes; mean age: 32.69.0 years) about to undergo LASIK were enrolled in this study. IOP was measured in all patients using FPT, Goldmann applanation tonometer (GAT) and noncontact tonometer (NCT). Central corneal thickness (CCT) was also measured, using the ultrasonic pachymeter. Changes in IOP and CCT were compared between before LASIK and 1 week after. Correlation between CCT change and IOP change with each tonometer were also evaluated. Results: IOP readings using GAT or NCT were significantly lowered after LASIK (IOPpre =13.12.1 mmHg, IOPpost=8.81.7 mmHg, p<0.0001; IOPpre=14.72.1 mmHg, IOPpost=11.01.9 mmHg, p<0.0001 paired t-test, respectively). On the other hand, the IOP readings with FPT showed no significant changes between pre- and post- LASIK (IOPpre =16.32.3 mmHg, IOPpost=16.03.0mmHg). There was no statistically significant correlation between any IOPchange and CCT change. Conclusion: The increasing popularity of refractive surgery threatens accurate IOP measurement with applanation tonometers. However, this study, confirmed the usefulness of FPT in measuring IOP after LASIK.
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