The Effect of Intracorneal Ring Segments Implantation for Keratoconus on In Vivo Corneal Biomechanics Assessed With the Corvis ST

Vinciguerra, Riccardo, Fernández-Vega-Cueto, Luis, Poo-Lopez, Arancha, Eliasy, Ashkan ORCID: 0000-0002-4473-1900, Merayo-Lloves, Jesús, Elsheikh, Ahmed ORCID: 0000-0001-7456-1749, Madrid-Costa, David, Lisa, Carlos and Alfonso, José F (2022) The Effect of Intracorneal Ring Segments Implantation for Keratoconus on In Vivo Corneal Biomechanics Assessed With the Corvis ST. Journal of Refractive Surgery, 38 (4). pp. 264-269.

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Abstract

<h4>Purpose</h4>To evaluate the effect of the implantation of intracorneal ring segments (ICRS) in keratoconus on the dynamic corneal response (DCR) parameters obtained with the Corvis ST (Oculus Optikgeräte GmbH).<h4>Methods</h4>This prospective clinical study included patients who underwent ICRS implantation for keratoconus over a period of 1 year. On the day of the surgery and at least 1 month after ICRS implantation, the following measurements were made: corrected and uncorrected distance visual acuity, corneal tomography indices with the Pentacam (Oculus Optikgeräte GmbH), biomechanically corrected intraocular pressure (bIOP), Corvis ST DCR parameters, integrated inverse concave radius (1/R), deformation amplitude ratio (DA ratio), stiffness parameter at first applanation (SP-A1), stress-strain index (SSI), and highest concavity radius (HRC).<h4>Results</h4>Fifty-one eyes of 40 patients were included with a median follow-up time of 3 months (interquartile ratio [IQR]: 2 to 6 months). Statistical analysis showed that ICRS implantation did not affect corneal biomechanical measurements evaluated with the Corvis ST, which was demonstrated by non-significant changes in the SP-A1 (<i>P</i> = .637), 1/R (<i>P</i> = .647), HRC (<i>P</i> = .177), DA ratio (<i>P</i> = .735), and SSI (<i>P</i> = .501). Additionally, the results showed that bIOP measurements were not significantly affected by ICRS implantation (<i>P</i> = .113).<h4>Conclusions</h4>ICRS implantation does not affect corneal biomechanical measurements in early follow-up. <b>[<i>J Refract Surg</i>. 2022;38(4):264-269.]</b>.

Item Type:	Article
Uncontrolled Keywords:	Cornea, Humans, Keratoconus, Corneal Topography, Prospective Studies, Biomechanical Phenomena
Divisions:	Faculty of Science and Engineering > School of Engineering
Depositing User:	Symplectic Admin
Date Deposited:	19 Apr 2022 15:15
Last Modified:	01 Apr 2023 01:30
DOI:	10.3928/1081597x-20220202-01
Related URLs:	Author Publisher
URI:	https://livrepository.liverpool.ac.uk/id/eprint/3153357