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Following LASIK, Goldmann tonometry produces variable IOP readings

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Dynamic contour tonometry is more accurate than Goldmann applanation tonometry for measuring intraocular pressure in eyes that have had LASIK, according to a study comparing the two techniques.

Claude Kaufmann, MD, and colleagues with the University of Zurich, Switzerland, performed the prospective, single center study. They described dynamic contour tonometry (DCT) as “a novel measuring technique, designed to measure IOP largely independent of corneal thickness and curvature.”

IOP was measured using both Goldmann tonometry and DCT before and after surgery on patients undergoing LASIK for the first time. Only one eye was treated, with the contralateral, untreated eyes serving as paired controls.

According to the study, both methods showed agreement before surgery. Significantly reduced IOP measurements were noted using Goldmann applanation tonometry following LASIK, while DCT showed no significant changes from preop to postop.

IOP readings decreased by 3 ± 1.9 mm Hg using Goldmann applanation tonometry (P < .001) and –0.2 ± 1.5 mm Hg (P = .3) using dynamic contour tonometry.

The study is published in Investigative Ophthalmology & Visual Science.