Aberrometric Outcomes of Intrastromal Corneal Ring Segment (KeraRing 355) Implantation Using PocketMaker Microkeratome in Patients with KeratoconusKhosrow Jadidi1, Farhad Nejat2, Aliagha Alishiri1, Leila Janani3, Abdollah Pashaei Abdollah Pashaei4 and Seyed Aliasghar Mosavi1*
- *Corresponding Author:
- Seyed Aliasghar Mosavi
Department of Ophthalmology
Baqiyatallah University of Medical Sciences, Tehran, Iran
E-mail: [email protected]
Received date: January 04, 2017; Accepted date: February 25, 2017; Published date: February 28, 2017
Citation: Jadidi K, Nejat F, Alishiri A, Janani L, Pashaei APA, et al. (2017) Aberrometric Outcomes of Intrastromal Corneal Ring Segment (KeraRing 355) Implantation Using PocketMaker Microkeratome in Patients with Keratoconus. J Clin Exp Ophthalmol 8:640. doi: 10.4172/2155-9570.1000640
Copyright: © 2017 Jadidi K, et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
Objective: To evaluate aberrometric changes in corneas with keratoconus implanted with intrastromal corneal ring segment (Keraring 355) during a 3-months follow-up.
Design: Prospective, consecutive case series
Methods: In this interventional study, 22 eyes of 21 keratoconic patients with mean age of 29 ± 6 years who underwent KeraRing 355 intrastromal corneal ring insertion using a Pocket Maker Microkeratome for channel creation and completed at least three months of follow-up were included. Uncorrected visual acuity (UCVA), best spectacle corrected visual acuity (BSCVA), refractive outcome, Orbscan finding and corneal aberrations were assessed.
Results: Three months postoperately, Low order aberration (defocus and astigmatism) decreased significantly (P<0.001). No statistically significant changes were detected in total RMS, trefoil, secondary trefoil and coma. Moreover, a statistically significant increase in quatrefoil, secondary coma, spherical aberration and secondary spherical was found. In term of visual outcomes, the mean UCVA (in LogMAR value) improved significantly from 0.75 ± 0.33 to 0.31 ± 0.23 and the mean BSCVA improved (from 0.31 ± 0.16 to 0.19 ± 0.15) (P<0.05). The mean spherical refractive error improved (from -1.37 ± 1.36 to 0.01 ± 2.47) and the mean cylindrical refractive error decreased significantly (from -3.8 ± 1.03 to -2.1 ± 1.27 (P<0.001)). Also, the mean keratometry value decreased from 47.61 ± 2.03 to 42.50 ± 2.76. Conclusion: KeraRing 355 implantation provided significant improvement in low order aberrations but was not effective in high order aberrations (HOA) in low/moderate keratoconus patients. However, UCVA, BCVA, spherical and cylindrical refractive error and keratometry results improved significantly.