Comparison of IOP obtained in different kind of eyes with contact and no contact tonometers

Sandro Sbordone; Adele Ragucci; Gennarfrancesco Iaccarino; Gabriele Scognamiglio; Angelo Leone; Ugo Antonello Gironi Carnevale; Michele Lanza

doi:10.4103/ojo.ojo_147_21

Comparison of IOP obtained in different kind of eyes with contact and no contact tonometers

Oman J Ophthalmol. 2022 Nov 2;15(3):315-320. doi: 10.4103/ojo.ojo_147_21. eCollection 2022 Sep-Dec.

Authors

Sandro Sbordone¹, Adele Ragucci¹, Gennarfrancesco Iaccarino¹, Gabriele Scognamiglio¹, Angelo Leone¹, Ugo Antonello Gironi Carnevale¹, Michele Lanza¹

Affiliation

¹ Department of Medical, Surgical and Dental Specialites, Campania University "Luigi Vanvitelli", Napoli, Italy.

Abstract

Background: The aim of this study is to analyze and compare the intraocular pressure (IOP) values measured in three different kinds of participants such as healthy subjects (HS), keratoconus patients (KP), and those who underwent myopic photorefractive keratectomy (MPRK). The devices used in this study are the Goldmann Applanation Tonometry (GAT), the dynamic contour tonometry (DCT), the ocular response analyzer (ORA), and the Corvis ST (CST).

Subjects and methods: This research included 92 eyes of 92 h, 63 eyes of 63 KP, and 58 eyes of 58 MPRKM. Each participant underwent a complete ophthalmic evaluation and IOP measurement with GAT, DCT, ORA, and CST. A statistical analysis was conducted to detect possible differences and correlations.

Results: First, according to the observed data, HS eyes displayed mean IOP values measured with GAT, DCT, ORA, and CST, respectively, 15.82 ± 2.74 mmHg, 17.63 ± 2.28 mmHg, 16.24 ± 3.14 mmHg, and 17.31 ± 3.21 mmHg. Then, KP eyes showed mean IOP values measured with GAT, DCT, ORA, and CST of, respectively, 14.89 ± 1.64 mmHg, 16.97 ± 2.08 mmHg, 13.09 ± 3.12 mmHg, and 13.78 ± 2.11 mmHg. Finally, MPRK eyes showed mean IOP values measured with GAT, DCT, ORA, and CST of, respectively, 13.92 ± 1.34 mmHg, 15.39 ± 2.86 mmHg, 16.63 ± 2.51 mmHg, and 15.06 ± 1.56 mmHg.

Conclusion: According to the observed data, ORA and GAT might be used interchangeably in HS, whereas GAT, ORA, and CST in KP eyes. Moreover, it has been noticed that in those eyes that previously undergone a myopic PRK, GAT provided lower values of IOP in comparison with other devices.

Keywords: Corvis ST; dynamic contour tonometry; ocular response analyzer; refractive surgery; tonometry.