One of the goals of cross-linking is to make the cornea more regular, allowing for soft contact lenses to replace the need for rigid gas permeable lenses. Rigid gas permeable lenses are good for vision in Keratoconus, but without warning can cause central scarring and can aggravate the condition. Your ophthalmologist will tell you if soft contact lenses are possible after cross-linking and how soon after treatment you may begin wearing them.