Comparison Of Intraocular Pressure Measurements Obtained By Different Tonometers In Eyes Underwent Refractive Surgery
Published 2023 - 41st Congress of the ESCRS
Reference: FP11.07 | Type: Free paper | DOI: 10.82333/4x3v-qz71
Authors: Anastasia Tsiogka* 1 , Ioannis Giachos 1 , Evangelia Papakonstantinou 1 , Eythymios Karmiris 1
1Ophthalmology,General Hospital of Athens ''Georgios Gennimatas'',Athens,Greece
Purpose
To assess the agreement among four types of intraocular pressure (IOP) measurements: IOP obtained by Goldmann applanation tonometer (IOP-GAT),IOP obtained by an air-puff tonometer (Nidek NT-510)(IOP-NCT), the non-corrected IOP obtained by the Corneal Visualization Scheimpflug Technology (IOP-Corvis) and the biomechanically corrected IOP obtained by the Corvis ST (bIOP-Corvis) in patients that underwent refractive surgery.
Setting
Cross sectional study
Methods
This cross sectional study recruited 52 individuals, hence a total of 104 eyes. Each patient underwent IOP evaluation via GAT, Nidek NT-510 and Corvis ST. The differences between IOP readings were compared using one-way repeated-measures analysis of variance (ANOVA), followed by Bonferroni correction to adjust for multiple comparisons. Bland-Altman plots were constructed for the intermethod agreement of the IOP measurements. The difference between the IOP measurements was tested on correlation against CCT, age, refractive surgery and corneal biomechanics with multivariate mixed effect linear regression models.
Results
In the LASIK group bIOP-Corvis showed the highest values (15.08±2.6mmHg), followed by IOP-NCT (14.43± 2.7mmHg), IOP-GAT (13.51± 3mmHg) and IOP-Corvis (12.57± 3.2mmHg). In the PRK group bIOP-Corvis showed the highest values (14.4± 1.9mmHg), followed by IOP-NCT (13.4± 2.3mmHg), IOP-GAT (13.4± 2.9mmHg) and IOP-Corvis (12.55± 3.1mmHg). There were statistically significant differences in IOP measurements among all the ANOVA pairwise comparisons. Bland Altman analysis revealed a notable bias among all IOP comparisons between groups. In multivariate mixed effect linear regression analysis, in the LASIK group, the most differences between the IOP measurements were significantly correlated to CCT, where in the PRK group to CCT, A1Velocity and SPA1.
Conclusions
Compared with GAT and Nidek NT-510, the Corvis-derived IOPs were recorded either the lowest as IOP- Corvis or the highest as bIOP-Corvis in LASIK and PRK group. In the PRK group, differences in the IOP measurements were statistically significantly correlated with corneal biomechanics, where in the LASIK group only CCT was found to have a statistically significant correlation