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Larissa Rossana Stival, Belquiz A Nassaralla, Marisa Figueiredo, Frederico Bicalho, Joao J Nassaralla; INTRASTROMAL CORNEAL RING SEGMENT IMPLANTATION FOR ECTASIA AFTER REFRACTIVE SURGERY. Invest. Ophthalmol. Vis. Sci. 2014;55(13):4232.
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© ARVO (1962-2015); The Authors (2016-present)
To evaluate the clinical outcomes of intrastromal corneal ring segment (ICRS) implantation to correct keratoconus on eyes with prior refractive surgery.
Forty-two eyes of 26 patients, 14 men and 12 women, with postoperative keratectasia after PRK (8 eyes, Group A) and LASIK (34 eyes, Group B) were included in a nonrandomized, retrospective, observational case series. Mean age at the time of ICRS implantation was 30.5 years. Mean follow-up was 23,5 months (range, 1 to 86 months). Corneal tunnels were created by means of mechanical dissection in all eyes. Main outcome measures included UCVA, BCVA, refraction, keratometry and computerized analysis of corneal topography.
Mean preoperative refractive astigmatism decreased from -2.58 to -1.66D in Group A and -4.73 to -2.92D in Group B (p=0.0253). Mean keratometric astigmatism decreased from 44.05 to 42.92D in Group A and 47.42 to 46.06 D in Group B (p=0.2975). The mean spherical component was reduced from -2.97 to -2.05D in Group A and -3.32 to -2.11D in Group B (p= 0.4692). There were no intraoperative or postoperative complications.
ICRS implantation is an useful option for the correction of iatrogenic keratectasia following refractive surgery.
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