Intracorneal ring segments aided by femtosecond laser for the correction of residual astigmatism after keratoplasty

• Autores: Ester Fernández López, Adriana Fandiño López, Mikhail Hernández Díaz, F. Pastor-Pascual, Cristina Peris Martínez
• Localización: Journal of Emmetropia: Journal of Cataract, Refractive and Corneal Surgery, ISSN-e 2171-4703, Vol. 5, Nº. 2, 2014, págs. 69-75
• Idioma: inglés
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• Resumen

  • PURPOSE: To evaluate the efficacy of femtosecond laser-assisted intracorneal ring segments (ICRS) implantation for correcting residual astigmatism following keratoplasty.

    SETTING: Fundación Oftalmológica del Mediterráneo (FOM), Valencia, Spain.

    METHODS: This prospective non-comparative interventional case series comprised eight eyes of eight patients with high residual astigmatism after keratoplasty, who had Keraring® ICRS implantation aided by femtosecond laser (FL). We evaluated uncorrected visual acuity (UCVA), best corrected visual acuity (BCVA), refractive astigmatism and corneal maximum (Kmax) and minimum curvature (Kmin) at one, three and six months post-surgery.

    RESULTS: Mean UCVA improved from 0.10  ±  0.18 pre-surgery to 0.18  ±  0.12 at six months post-surgery (p = 0.16). Mean preoperative BCVA was 0.33 ± 0.15 and 0.5 ± 0.21 at six months (p = 0.07). By the last follow-up visit, four patients had gained two or more lines, two patients had gained one line and two patients had lost less than one line of visual acuity (VA). There was a statistically significant reduction in cylinder value from −5.19 ± 2.98 D to −2.75 ± 2.04 D (p = 0.03) and mean Kmax from 50.14 ± 1.90 D to 47.16 ± 1.51 D (p = 0.01). Kmin decreased from 41.94 ± 2.46 D to 40.73 ± 2.89 D (p = 0.48).

    CONCLUSION: The implantation of ICRS with FS laser may be an effective procedure for improving VA and refractive and topographic astigmatism in patients with residual astigmatism post-keratoplasty.