As you said, the drug designed prevent progression. Riboflavin 5´-phosphate topical ophthalmic (Photrexa, Photrexa Viscous) was approved by the US Food and Drug Administration (FDA) in April 2016 for use in corneal collagen cross-linking (CXL) in combination with the KXL System.
Dear Kimia, we worked in this field in the last 5 years in order to understand how to improve the corneal crosslinking treatment. Read our article about that. Now we are going to design a novel drug deliver system togther with a novel irradiation device to take care of the todays technology limitations. Let me know if you like more information about it.