Corneal asphericity changes after implantation of intrastromal corneal ring segments in keratoconus

• Autores: Leonardo Torquetti, Paulo Ferrara
• Localización: Journal of Emmetropia: Journal of Cataract, Refractive and Corneal Surgery, ISSN-e 2171-4703, Vol. 1, Nº. 4, 2010, págs. 178-181
• Idioma: inglés
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• Resumen

  • PURPOSE: To report the corneal asphericity (Q) changes induced by the implantation of Ferrara intrastromal corneal ring segment (ICRS) in keratoconus.

    METHODS: Intrastromal Ferrara ring segments were placed in 135 eyes of 123 patients with keratoconus. The mean follow-up time was 16.46 ± 5.28 [SD] months (range 4 to 24 months). Corneal topography was obtained from Pentacam (Oculus Pentacam®, USA).

    Statistical analysis included preoperative and postoperative asphericity (Q) and keratometry (K).

    RESULTS: The ICRS implantation significantly reduced the mean corneal asphericity from –0.85 to –0.32 (p=0.000). There was significant Q reduction after implantation of all ring thicknesses, except by the 150 µm ring, which did not induced significant changes in Q values. It was observed a significant reduction in Q values in all evolution grades of keratoconus The mean K1 decreased from 46.58 to 44.27 (p= 0.000) and the mean K2 decreased from 51.28 to 46.66 (p= 0.000).

    CONCLUSION: The ICRS can effectively reduce the excess of prolateness found in keratoconus, modifying the cornea shape to a more physiologic, aspheric shape.