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Ferrara intracorneal ring segments for keratoconus.

Sérgio Kwitko1, Nórton Souto Severo

  • 1Department of Ophthalmology, Hospital de Clínicas de Porto Alegre, Avenida Nilo Peçanha, 7241-401 Porto Alegre-RS, Brazil. Kwitko@ez-poa.com.br

Journal of Cataract and Refractive Surgery
|April 20, 2004
PubMed
Summary

Ferrara intracorneal ring segments safely improved vision and reduced refractive errors in keratoconus patients. This reversible procedure avoided or delayed penetrating keratoplasty in most cases.

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Area of Science:

  • Ophthalmology
  • Corneal Surgery
  • Vision Science

Background:

  • Keratoconus is a progressive thinning of the cornea, leading to irregular astigmatism and vision loss.
  • Intracorneal ring segments are used to regularize the corneal surface and improve visual acuity in keratoconus patients.

Purpose of the Study:

  • To evaluate the outcomes of Ferrara intracorneal ring segment implantation for the surgical management of keratoconus.
  • To assess visual acuity, refractive error, corneal topography, and complications associated with the procedure.

Main Methods:

  • A retrospective case series involving 51 eyes of 47 keratoconus patients who underwent Ferrara intracorneal ring segment implantation.
  • Analysis included uncorrected (UCVA) and best spectacle-corrected visual acuity (BSCVA), refractive astigmatism, corneal curvature, and topographic indices.

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Main Results:

  • Significant improvements were observed in both UCVA (86.4%) and BSCVA (86.4%) at a mean follow-up of 13 months.
  • Mean spherical equivalent decreased from -6.08 D to -4.55 D, and mean refractive astigmatism reduced from -3.82 D to -2.16 D.
  • Penetrating keratoplasty was avoided in 74.5% of eyes; complications included segment extrusion (19.6%) and keratitis (3.8%).

Conclusions:

  • Ferrara intracorneal ring segment implantation is a safe and reversible option for keratoconus.
  • The procedure leads to stable visual and refractive outcomes, effectively avoiding or delaying the need for penetrating keratoplasty.