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 post-operative 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.