{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,6,8]],"date-time":"2026-06-08T22:57:31Z","timestamp":1780959451043,"version":"3.54.1"},"reference-count":37,"publisher":"Korean Ophthalmological Society","issue":"3","license":[{"start":{"date-parts":[[2025,5,7]],"date-time":"2025-05-07T00:00:00Z","timestamp":1746576000000},"content-version":"tdm","delay-in-days":0,"URL":"http:\/\/creativecommons.org\/licenses\/by-nc\/4.0\/"}],"content-domain":{"domain":["ekjo.org"],"crossmark-restriction":true},"short-container-title":["Korean J Ophthalmol"],"published-print":{"date-parts":[[2025,6,5]]},"abstract":"<jats:p>Purpose: To compare intraocular pressure (IOP) readings from corneas with intracorneal corneal ring segments (ICRS) using various methods, including Goldmann applanation tonometry (GAT), Tonopen, corneal-compensated IOP from the Ocular Response Analyzer (ORA), and biomechanically corrected IOP from the Corneal Visualization Scheimpflug Technology (Corvis ST).Methods: This cross-sectional observational study included participants who had undergone ICRS implantation with KeraRing at least 3 months before the study. The mean IOP recorded by different instruments was compared using analysis of variance. Agreement among the methods was assessed with Bland-Altman plots.Results: A total of 54 eyes from 27 participants were enrolled. The mean IOP measured by Tonopen was significantly lower in the center compared to the peripheral quadrants (p &lt; 0.001). IOP measured by GAT was significantly lower than that measured by Tonopen (13.02 \u00b1 2.31 mmHg vs. 14.50 \u00b1 2.91 mmHg, p = 0.021). There were no significant differences between the IOP measurements provided by Tonopen, ORA, and Corvis ST. The corneal-compensated IOP from ORA and biomechanically corrected IOP from Corvis ST had the highest correlation, with a weak intraclass correlation coefficient of 0.38.Conclusions: IOP measurements using Tonopen were significantly lower in the central 5-mm zone compared to other quadrants. GAT measurements were significantly lower than those from Tonopen. Different measurement tools did not show a strong correlation. Corvis ST (biomechanically corrected IOP) tended to present lower readings at higher IOP levels in eyes with ICRS.<\/jats:p>","DOI":"10.3341\/kjo.2025.0016","type":"journal-article","created":{"date-parts":[[2025,5,7]],"date-time":"2025-05-07T07:41:06Z","timestamp":1746603666000},"page":"231-240","update-policy":"https:\/\/doi.org\/10.3341\/crossmark_policy","source":"Crossref","is-referenced-by-count":1,"title":["Assessment of Tonometry Methods in Keratoconic Eyes Following Intracorneal Ring Segments Implantation: A Comparative Study"],"prefix":"10.3341","volume":"39","author":[{"given":"Siamak","family":"Zarei-Ghanavati","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Seyed 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