Collagen crosslinking is in widespread use in polymer industry. It has been shown in laboratory studies to increase the biomechanical strength of the cornea and sclera. It is now used as a new method for treating keratoconus by the use of combined riboflavin and ultraviolet-A radiation. It arrests the progression of ectasia by increasing the stiffness of the cornea. It is considered a minimally invasive procedure with little side effects. It has been also used to treat iatrogenic keratectasia. It is now under trial for the treatment of pathological myopiaKey words: collagen crosslinking