The customization of laser vision correction treatments for decentered ablations and similar corneal aberrations. The Food and Drug Administration has approved the use of Custom Contoured Ablation Pattern (C-CAP) method under a Humanitarian Device Exemption.

C-CAP uses a liquid material that is applied to the outside of the eye. In some cases, a contact lens is applied over the liquid to give a smooth surface. The liquid becomes more firm, and the contact (if used) is removed. A broadbeam laser applies energy to the entire treatment area with each pulse. The liquid ablates at the same rate as corneal tissue. As the laser removes tissue and the liquid, the high areas of the cornea are exposed and ablated down to the lowest areas. C-CAP has been shown to resolve many topographical imperfections caused by disease, trauma, or surgery.