Prior to your consultation and surgery at SkyVision Centers, your contact lenses must remain out of your eyes for an extended period of time determined by lens type. While our time requirement may seem more extreme than that of other centers, we feel the longer you are out of your lenses, the more accurate our measurements and the better your outcome. Contact lenses of all types reshape the cornea, sometimes permanently. Soft lenses (this includes daily, extended wear, and Toric lenses for astigmatism) are to be kept out of your eyes for one week. Gas Permeable lenses should be kept out of your eyes a minimum of one month. Usually, gas perm wearers have worn these lenses for years. If this is true in your case, additional time without the lenses may be needed (usually one additional week for every decade of use). Hard lenses, though extremely rare anymore, may require three to six months of non-use. PRK is also generally done both eyes on the same day as well.