For the last several decades we have had the advantage of using lasers to perform visual correction. The most frequently used laser is called Excimer and works by removing tissue and reshaping the cornea in a controlled manner. The process is called ablation, and it has evolved from a conventional treatment based on subjective information, to a very precise, customized, computer guided technique that utilizes Wavefront Analysis. This technology provides individualized treatments that correct optical aberrations and minimize undesired side effects such as difficulty with night vision and decreased contrast sensitivity. In addition, modern lasers are capable of following the movements of the eye during treatment, which allows for laser pulses to be applied in the exact location they are needed.