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Long-Term Follow-Up of Intrastromal Corneal Ring Segments in Paracentral Keratoconus with Coincident Corneal Keratometric, Comatic, and Refractive Axes: Stability of the Procedure

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Fernández-Vega Cueto, Luis and Lisa Fernández, Carlos and Madrid Costa, David and Merayo Lloves, Jesús Manuel and Alfonso, José F. (2017) Long-Term Follow-Up of Intrastromal Corneal Ring Segments in Paracentral Keratoconus with Coincident Corneal Keratometric, Comatic, and Refractive Axes: Stability of the Procedure. Journal of Ophthalmology, 2017 . pp. 1325-1330. ISSN 2090-004X

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Official URL: https://doi.org/10.1155/2017/4058026




Abstract

Purpose: To assess the long-term outcomes of implanting intrastromal corneal ring segments (ICRSs) to correct central keratoconus with a high corneal asphericity value.
Methods: Forty-three eyes with central keratoconus with a corneal asphericity value ≥-1.00 were evaluated before and after implanting an inferior 210-degree arc-length Ferrara-type AFR5 ICRS (AJL Ophthalmic, Spain). Logarithm of the minimum angle of resolution uncorrected (UDVA) and best-corrected (CDVA) distance visual acuity, corneal asphericity, root mean square for coma-like aberrations [computed for the Zernike terms Z (3, 1) and Z (3, -1)], and residual refractive errors analyzed using vector analysis were recorded before and at all follow-up visits. The postoperative follow-up duration was 3 years in all cases.
Result: Mean UDVA (logarithm of the minimum angle of resolution scale) rose from 1.18 ± 0.59 to a postoperative 0.53 ± 0.39 after ICRS implantation (P < 0.0001). Mean CDVA varied in turn from 0.36 ± 0.18 to 0.17 ± 0.10 (P < 0.0001). CDVA remained unchanged or improved in all eyes after surgery. Both UDVA and CDVA were stable over the postoperative period (P > 0.05). The spherical equivalent declined steeply after ICRS implantation (P < 0.0001). Both spherical equivalent and refractive cylinder were stable over the postoperative period. The corneal asphericity and root mean square values for coma-like aberrations exhibited statistically significant decreases 6 months after ICRS implantation (P < 0.0001) and were also stable over postoperative follow-up (P > 0.05).
Conclusions: These results suggest that implanting a single, inferior, 210-degree arc-length Ferrara-type ICRS is a safe, effective, and stable procedure for treating patients with central hyperprolate keratoconus.


Item Type:Article
Additional Information:

Received 20 December 2016; Revised 3 April 2017; Accepted 27 July 2017; Published 29 August 2017

Uncontrolled Keywords:Intrastromal corneal rings segments; ICRS; Cornea surgery; Paracentral keratoconus; Visual acuity; Refractive errors; keratometric values
Subjects:Medical sciences > Medicine > Surgery
Medical sciences > Medicine > Ophtalmology
Medical sciences > Optics > Visual perception
ID Code:46391
Deposited On:23 Feb 2018 13:15
Last Modified:23 Feb 2018 13:15

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