[Asymmetric intrastromal corneal ring for the treatment of keratoconus].

PURPOSE To analyze corneal curvature and visual acuity after asymmetric intrastromal corneal rings implantation, not following the nomogram proposed by the manufacturer. METHODS Seven eyes of seven keratoconus patients which had asymmetric corneal rings implanted in their corneal stroma were studied. RESULTS A flattening of the average corneal keratometry was noted in all patients, as well as an increase of the postoperative corneal asymmetry. CONCLUSIONS Asymmetric intrastromal corneal ring implant improves the postoperative visual acuity with and without correction. As a result we noticed flattening of the corneal curvature at the thicker ring implantation spot and increase of corneal asymmetry.