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Applanation resonance tonometry offers reliable IOP readings after LASEK
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Dynamic applanation resonance tonometry offered the most reliable IOP readings 2 years after LASEK, a study found.
“Dynamic ART was shown to be more suitable for IOP measurement in LASEK-treated eyes; however, this has to be confirmed in larger trials,” the study authors said.
The researchers compared IOP measurements taken 24 months after LASEK with three tonometry methods: Goldmann applanation tonometry (GAT), Pascal dynamic contour tonometry (DCT) and applanation resonance tonometry (ART). Two ART prototypes were used, dynamic and static.
The prospective, randomized study included 38 eyes of 38 myopic patients who underwent LASEK and subsequent IOP measurements at 3, 6 and 24 months. Corneal curvature, central corneal thickness and logMAR visual acuity were assessed.
Study results showed that ART was the only tonometry method that did not yield significantly decreased IOP measurements at 24 months compared with baseline values.
Mean IOP readings with GAT were 14.2 mm Hg at baseline and 12.3 mm Hg at 24 months. Mean DCT readings were 14.7 mm Hg at baseline and 13.8 mm Hg at 24 months. Mean baseline ART measurements were 14.1 mm Hg with both dynamic and static ART. Mean readings at 24 months were 14 mm Hg with dynamic ART and 13 mm Hg with static ART.
All three tonometry methods yielded markedly decreased IOP measurements at 3 and 6 months compared with baseline readings and correlated significantly with one another, the authors said.
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