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Submitted: 2023-01-24
DOI: 10.35119/myjo.v7i1.374
Original Articles
Published: 2025-01-27

Comparison of three measurement methods of intraocular pressure in patients with keratoconus undergoing MyoRing implantation

Department of Ophthalmology, Bina Eye Hospital, Tehran, Iran
Department of Ophthalmology, Bina Eye Hospital, Tehran, Iran; Department of Ophthalmology, Vision Health Research Centre, Semnan University of Medical Sciences, Semnan, Iran
Department of Ophthalmology, Bina Eye Hospital, Tehran, Iran; Department of Ophthalmology, Vision Health Research Centre, Semnan University of Medical Sciences, Semnan, Iran
Department of Ophthalmology, Bina Eye Hospital, Tehran, Iran; Department of Ophthalmology, Vision Health Research Centre, Semnan University of Medical Sciences, Semnan, Iran
Department of Ophthalmology, Bina Eye Hospital, Tehran, Iran; School of Medicine, Hamedan University of Medical Sciences, Hamedan, Iran
Department of Ophthalmology, Bina Eye Hospital, Tehran, Iran; School of Optometry and Vision Science, University New South Wales, Sydney, Australia
intraocular pressure keratoconus MyoRing tonometers

Abstract

Purpose: This study aimed to assess intraocular pressure (IOP) before and after MyoRing implantation in keratoconus patients.

Methods: IOP was measured in 13 eyes before and six months after MyoRing implantation using Goldmann applanation (as the gold standard), iCare, and Corvis ST (uncorrected, corrected, and biomechanically corrected).

Results: Preoperatively, IOP levels were overestimated using iCare and Corvis (biomechanically corrected). However, uncorrected Corvis measurements were associated with underestimation. Postoperatively, iCare and Corvis (biomechanically corrected) continued to show overestimation, whereas uncorrected Corvis measurements resulted in underestimating IOP.

Conclusion: The Goldmann applanation tonometer proves to be a reliable gold standard for obtaining consistent IOP readings in keratoconus patients undergoing MyoRing implantation. Conversely, using iCare and Corvis before and after surgery yielded inconsistent results.