There are various methods to do CXL collagen crosslinking to fix keratoconus eye diseases one may e is the rapidness of the crosslinking procedure. Most crosslinking procedures are a 1/2 hour treatment session. This is the standard protocol being used in Europe and with the FDA Studies in the United States. It uses a lower frequency of ultraviolet light with the usage of riboflavin eyedrops applied to the cornea. Newer crosslinking devices now use a higher voltage ultraviolet light that cuts down the exposure treatment time. The treatment can be as low as just 3 minutes! it is now being studied in Europe which duration of light exposure and intensity of ultraviolet light is most efficacious for crosslinking in the future.