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Middle East African Journal of Ophthalmology Middle East African Journal of Ophthalmology
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Year : 2014  |  Volume : 21  |  Issue : 1  |  Page : 3-9

Intrastromal corneal ring segments: How successful is the surgical treatment of keratoconus?

1 Keratoconus Unit, Vissum Coorporation; Division of Ophthalmology, Universidad Miguel Hernández, Alicante, Spain
2 Anterior Segment Department, Centro de Oftalmología Barraquer, Barcelona, Spain
3 Anterior Segment Department, Vissum Corporation, Madrid, Spain
4 Ophthalmology Department, Coimbra University Hospital, Coimbra, Portugal

Correspondence Address:
Jorge L Alio
Avda de Denia s/n, Edificio Vissum, 03016 Alicante
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Source of Support: This study has been supported in part by a grant from the Spanish Ministry of Economy and Competitiveness, Instituto Carlos III, Red Temática de Investigación Cooperativa en Salud "Prevención, detección precozy tratamiento de la patología ocular prevalente, degenerativay crónica ", Subprograma "Dioptrio oculary patologías frecuentes" (RD12/0034/0007.), Conflict of Interest: None

DOI: 10.4103/0974-9233.124076

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This review evaluates the outcomes of intrastromal corneal ring segment (ICRS) implantation for the treatment of keratoconus considering a new grading system based on the preoperative visual impairment of the patient. Additionally, a five-year follow-up analysis of patients with stable and progressive keratoconus is performed in order to assess the long term stability of the surgical procedure. Corrected distance visual acuity decreased statistically significantly in patients with mild keratoconus (P < 0.01) but statistically significantly increased in all other grades (P < 0.05). The improvement in visual acuity and the decrease of keratometric and aberrometric values were stable throughout a long period of time in patients with stable keratoconus. In patients with progressive form keratoconus, a significant improvement was found immediately after the procedure, however clinically relevant regression greater than 3 D was observed at the end of the follow up period.

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