PRK Xtra is a 3 minute corneal cross-linking procedure performed in conjunction with PRK.Cross-linking is a medical procedure that combines the use of ultra-violet light and riboflavin eye drops to add biomechanical strength to the cornea.
After completion of a standard PRK procedure, a few drops of riboflavin are applied to the cornea and then the riboflavin is exposed to ultraviolet A light. The light activates the riboflavin, which leads to the formation of chemical bonds between collagen molecules. These bonds strengthen the cornea.
The ultraviolet A light exposure during a Xtra procedure is comparable to, or even less than, the exposure of the eye to the ultraviolet light in sunlight for one full day outdoors in the summer.Riboflavin, also known as Vitamin B2, is naturally occurring in the body, including the eye.It is a photosensitizer that has been safely used in corneal cross-linking procedures for over a decade. Riboflavin is non-toxic and it is used as an additive in food and pharmaceuticals.
Click here for a video about Xtra.