RT Journal Article
T1 Intrastromal corneal ring segment implantation for high astigmatism after penetrating keratoplasty
A1 Arriola Villalobos, Pedro
A1 Díaz Valle, David
A1 Güell, José Luis
A1 Iradier Urrutia, María Teresa
A1 Jiménez Alfaro, Iñigo
A1 Cuiña Sardiña, Ricardo
A1 Benítez Del Castillo Sánchez, José Manuel
AB Purpose: To evaluate the safety and efficacy of intracorneal ring segments (ICRS) for high astigmatism after penetrating keratoplasty (PKP). Setting: Department of Ocular Surface and Inflammation, Ophthalmology, Hospital Clínico San Carlos, Complutense University, Madrid, Spain. Methods: This retrospective noncomparative study comprised eyes with high post-PKP astigmatism (>4.00 diopters [D]), contact lens intolerance, and a minimum follow-up of 24 months who had ICRS (Kerarings) implantation by mechanical stromal dissection. Corrected distance visual acuity (CDVA), refractive astigmatism, spherical equivalent (SE), surgically induced astigmatism (SIA), central corneal curvature, topographic corneal astigmatism, average corneal power, and complications were assessed. Results: The mean CDVA was statistically significantly better postoperatively (0.23 ± 0.21) than preoperatively (0.98 ± 0.27) (P = .007); no eye lost CDVA. The mean refractive astigmatism decreased from 6.17 ± 1.12 D to 4.04 ± 1.67 D (P = .068) and the mean SE from -3.17 ± 5.48 D to -0.12 ± 2.40 D (P = .34). The mean SIA was 4.55 ± 2.83 D. The mean central corneal curvature decreased from 46.28 ± 1.73 D to 42.09 ± 3.20 D (P<.01); the mean topographic corneal astigmatism, from 7.07 ± 2.52 D to 4.48 ± 2.00 D (P<.05) and the mean average corneal power from 45.92 ± 1.59 D to 41.88 ± 3.37 D (P<.01); all decreases were statistically significant. One patient developed deep vascularization in the lower temporal stromal channel that resolved after ICRS removal. One patient reported significant night halos. Conclusion: Implantation of ICRS for high post-PKP astigmatism reduced corneal curvature and topographic astigmatism, significantly improving CDVA
PB Wolters Kluwer
SN 0886-3350
YR 2009
FD 2009-11-15
LK https://hdl.handle.net/20.500.14352/112578
UL https://hdl.handle.net/20.500.14352/112578
LA eng
NO Arriola-Villalobos, Pedro MD∗; Díaz-Valle, David MD, PhD; Güell, Jose Luis MD, PhD; Iradier-Urrutia, María Teresa MD, PhD; Jiménez-Alfaro, Iñigo MD, PhD; Cuiña-Sardiña, Ricardo MD; Benítez-del-Castillo, José Manuel MD, PhD. Intrastromal corneal ring segment implantation for high astigmatism after penetrating keratoplasty. Journal of Cataract & Refractive Surgery 35(11):p 1878-1884, November 2009. | DOI: 10.1016/j.jcrs.2009.05.060
DS Docta Complutense
RD 15 dic 2025