Study of the Safety and Effectiveness of Photochemically Induced Collagen Cross-Linking at an Irrandiance of 18 mW/cm2 in Eyes With Keratoconus or Ectasia.

Riboflavin drops are used every 2 minutes for 30+ minutes until the corneal stroma is saturated with Riboflavin as evidenced by observing Riboflavin in the Anterior chamber. Two arms in the study, one uses Riboflavin with Epithelium on and the other with Epithelium off. Once it is observed that the Riboflavin has penetrated the stroma and is seen in the anterior chamber, the cornea is exposed to Ultraviolet light at an irradiance level of 18mW/cm2 for 5 minutes. A contact lens is applied until the epithelium has fully healed in 3 to 5 days. The study is for 6 months. The corneal curvature as well as the uncorrected and best corrected vision and corneal thickness are evaluated pre-operatively and at 6 months. The primary variable that is assessed to determine the efficacy of the drug is the Kmax - Steep corneal curvature. Secondary effectiveness criteria are uncorrected and best corrected vision and corneal thickness. adverse events are also monitored.