Comparison of intraocular pressure measurements with the reichert pt100, the keeler pulsair intellipuff portable non‐contact tonometers and goldmann applanation tonometry

Purpose To compare the intraocular pressure (IOP) measurements by two portable tonometers, the Keeler Pulsair Intellipuff™ and the Reichert PT100™, with Goldmann applanation tonometry (GAT). Methods Prospective cross-sectional study conducted on normotensive and hypertensive patients. IOP was measured by the two portable non-contact tonometers and GAT in one eye of each patient in a random order. The Wilcoxon test was used to compare the differences between tonometers, the Spearman correlation test to evaluate the correlation among the methods, and Bland–Altman plots and intra-class Correlation Coefficient (ICC) to evaluate the agreement among the methods. Results 137 eyes of 137 patients were included. We found an excellent agreement (ICC > 0.75) between PT100™ and GAT and between Intellipuff™ and GAT in normotensive patients. We found a fair to good agreement (ICC 0.67) between PT100™ and GAT in hypertensive patients. The agreement we found between Intellipuff™ and GAT was also excellent in hypertensive patients (ICC 0.83). The differences between the measurements of the two non-contact tonometers and the GAT were significantly correlated to the central CCT. Conclusion The two non-contact tonometers agree well with GAT in normotensive patients. The Pulsair Intellipuff™ agrees also well with GAT in hypertensive patients.