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This abstract is assigned to session BOG-SBO 6 Glaucoma / Glaucome

Title	Is pulse synchronised pneumo tonometry more accurate than routine pneumo tonometry?
Abstract Nr.	A2045

Purpose	The pulse synchronized system of the Nidek non-contact pneumo tonometer has been incorporated to reduce the fluctuation in the measurements of the pneumo tonometer (PNT). The purpose is to compare the results of pulse synchronized PNT with routine PNT (without pulse synchronization) and Goldmann applanation tonometry (GAT).
Methods	148 eyes from 78 patients were enrolled. Patients were randomized in two groups. In the first group the sequence of measurements was: pulse synchronized PNT, routine PNT, and GAT. In the second group, the sequence was: routine PNT, pulse synchronized PNT, and GAT. The mean of three measurements were averaged for PNT and the mean of two measurements for GAT. All the measurements were performed by the same investigator, who was masked to GAT measurements. Bland and Altman plots were used to assess the agreement between the tonometry methods. A paired t-test with Bonferroni correction was used to compare the measurements.
Results	There was a good agreement between PNT measurements with and without pulse synchronization and GAT. In both groups pulse synchronized PNT was higher than routine PNT; PNT measurements with and without pulse synchronization were ± 2 mmHg higher than GAT (p < 0.001). The variability of pulse synchronized PNT was higher than the variability of the routine PNT.
Conclusion	The pulse system of the Nidek pneumo tonometer does not seem to be more accurate than routine pneumo tonometry (without pulse synchronization) when compared to GAT

Author 1

Last name	LAFAUT
Initials	AS
Department	Ophthalmologie, UZ
City	Leuven

Author 2

Last name	Van Malderen
Initials	L
Department	Ophthalmolgie, UZ
City	Leuven

Author 3

Last name	Zeyen
Initials	T
Department	Ophthalmologie, UZ
City	Leuven