COMPARISON BETWEEN DYNAMIC CONTOUR TONOMETRY AND GOLDMANN APPLANATION TONOMETRY CORRECTING EQUATIONS
Published 2024 - 28th ESCRS Winter Meeting
Reference: FP48 | Type: Submission | DOI: 10.82333/amp5-8475
Authors: Ferdinando Cione* 1 , Marco Gioia 1 , Gerardo La Padula 1 , Aniello La Marca 1 , Antonio Formicola 1 , Ciro Sannino 1 , Maddalena De Bernardo 1 , Nicola Rosa 1
1Department of Medicine, Surgery, and Dentistry “Scuola Medica Salernitana”,University of Salerno,Salerno,Italy
Purpose
To investigate the reliability of correcting Goldmann applanation tonometry (GAT) formulas in comparison with dynamic contour tonometry (DCT).
Setting
University Eye Clinic, Department of Medicine and Surgery, University of Salerno, Italy.
Methods
This study included one-hundred-twelve right eyes of 112 healthy subjects aged from 21 to 77 years, who underwent to a full ophthalmologic exam, including intraocular pressure (IOP) measurement with DCT and then with GAT. IOP values obtained with GAT were corrected with 10 equations and then compared with IOP values provided by DCT. The Student T-test was used for pair-wise comparisons of IOP obtained with DCT and GAT and with DCT and all IOP obtained after applying 10 correcting formulas. This latter test was also used for pair-wise comparison of differences between measurement obtained with and without IOP correction. A p-value less than 0.05 was considered statistically significant.
Results
Participants mean age was 42.24±4.08 years; mean IOP measured with DCT and GAT were respectively 17.61±2.87mmHg and 15.50±2.47mmHg. The mean discordance between DCT and GAT measurements was 2.11±2.24 mmHg. In absolute value, all the correcting formulas, tend to increase the difference between GAT and DCT, except to Śródka formula (p˂0.001), that reduced the difference between the two IOP measurement methods of −0.03±0.85 mmHg.
Conclusion
IOP measurements provided by GAT without any correction are lower than those provided by DCT. Śródka equation provides a statistically significant decrease of the difference between GAT and DCT measurements. Other equations do not provide a valid improvement of the agreement between the two methods, or they provide a worsening of the agreement.