Evaluation of biomechanically corrected intraocular pressure using Corvis ST and comparison of the Corvis ST, noncontact tonometer, and Goldmann applanation tonometer in patients with glaucoma

Yoshitaka Nakao, Yoshiaki Kiuchi, Hideaki Okumichi, Yoshitaka Nakao, Yoshiaki Kiuchi, Hideaki Okumichi

Abstract

Purpose: The aim of the study was to investigate the effects of various anatomical structures on intraocular pressure (IOP) measurements obtained by the Corneal Visualization Scheimpflug Technology (Corvis ST), Goldmann applanation tonometer (GAT), and noncontact tonometer (NCT), as well as to assess the interchangeability among the four types of IOP measurement: IOP-GAT, IOP-NCT, IOP-Corvis, and biomechanically corrected IOP (bIOP-Corvis), with a particular focus on bIOP-Corvis.

Materials and methods: We included 71 patients with primary open-angle glaucoma and assessed their IOP measurements obtained with the GAT, NCT, and Corvis ST using a repeated measures ANOVA, a paired t-test with Bonferroni correction, stepwise multiple regression analyses and Bland-Altman plots.

Results: IOP-GAT showed the highest values (13.5 ± 2.1 mmHg [mean ± standard deviation]), followed by IOP-NCT (13.2 ± 2.7 mmHg), IOP-Corvis (10.6 ± 2.8 mmHg), and bIOP-Corvis (10.0 ± 2.3 mmHg). With exceptions of bIOP-Corvis and IOP-GAT, all IOP variations were explained by regression coefficients involving the central corneal thickness. Bland-Altman plots showed a mean difference between IOP-GAT and the other IOP measurements (IOP-Corvis, bIOP-Corvis, and IOP-NCT), which were -2.90, -3.48, and -0.29 mmHg, respectively. The widths of the 95% limits of agreement between all pairs of IOP measurements were greater than 3 mmHg.

Conclusion: IOP values obtained with the Corvis ST, NCT, and GAT were not interchangeable. The bIOP-Corvis measurement corrected for the ocular structure.

Conflict of interest statement

The authors have declared that no competing interests exist.

Figures

Fig 1. Bland–Altman plots between IOPs obtained…
Fig 1. Bland–Altman plots between IOPs obtained with the Corvis ST, GAT, and CT-90A.
A, IOP-Corvis and IOP-GAT. B, bIOP-Corvis and IOP-GAT. C, IOP-NCT and IOP-GAT. The mean values and 95% LOA are indicated by bold lines and solid lines, respectively. IOP, intraocular pressure; IOP-Corvis, the IOP obtained by Corvis ST; bIOP-Corvis, corrected IOP-Corvis; IOP-GAT, the IOP obtained by Goldmann applanation tonometry; IOP-NCT, the IOP obtained by CT-90A tonometer; LOA, limits of agreement.

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