Corneal ectasias are non-inflammatory, progressive degenerations of the cornea. Keratoconus being by far the most common type of ectasia. This condition causes a progressive thinning and irregularity of the cornea, which is the clear front shield of the eye. If keratoconus becomes advanced, it can significantly limit vision even with contacts or glasses. 

To date, the only way to stop progressive ectasias in the cornea is with corneal collagen cross-linking. This procedure enhances the natural chemical crosslinking of the cornea and increases rigidity and promotes stability. It is important to consider cross-linking while the vision is still correctable with glasses or contacts.