Intraestromal Corneal Ring in Mild Keratoconus

Intrastromal Corneal Ring Was Effective for the Treatment of Mild Keratoconus

To determine whether the implantation of an intrastromal corneal ring is an effective treatment for a homogeneous group of mild keratoconus patients.

A group of 65 patients with mild keratoconus were implanted with a Ferrara ring in a single eye. Six months after surgery, the aberrations were measured and the visual function was determined using clinical indices. The aberrations, especially comatic aberration (coma), were measured independently.

Inclusion Criteria:

• Investigators used the Amsler-Krumeich classification and included only patients classified as grade I or II.

Exclusion Criteria:

• Investigators excluded patients with central corneal scarring, with other eye disorders, or with previous ocular surgery. We also excluded patients with a history of herpes infection, keratitis, corneal dystrophies, diagnoses of autoimmune diseases, systemic connective tissue disorders, or acute keratoconus.