In the normal eye emmetropic eye, rays are bent by the cornea and the lens to focus on the retina. Myopia (nearsightedness), Hyperopia (farsightedness) and Astigmatism are conditions where rays of light do not focus on the retina and contact lenses or glasses are required. LASIK or PRK Surgery reshapes the cornea and reduces or eliminates the need for prosthetic optical devices is the condition where light rays focus in front of the retina. The LASIK Surgery Video Informed Consent can be found here and the associated pdf file here. Custom ablation using the iDesign CustomVue and the VISX S4 Excimer Laser is discussed here.