Contact lenses often cause what is called "spectacle blur." This means that the contacts make your glasses not exactly correct due to the swelling or distortion of the shape of your eye which can affect the readings doctors take of your eyeglass prescription. The laser must be programmed with your correct prescription to achieve a good LASIK or PRK result. It takes some time for the cornea to return to normal. In the case of hard contact lenses this can be months, and with soft lenses it is weeks, but you will need to leave your contacts out as your doctor requests. There is no shortcut around this requirement except that sometimes soft lenses can be worn for a period of time in hard lens patients, and then the time is shortened to the soft lens out time. To get the best results doctors need accurate data, and your contacts must be out long enough to attain these readings.