Corneal haze of any grade was less common in MMC-PRK compared to PRK at @ month ( @ % vs @ % ; P < @ ) and @ months ( @ % vs @ % ; P = @ ) postoperatively ; it was also less common in MMC-PRK compared to LASEK at @ month ( @ % vs @ % ; P < @ ) , @ months ( @ % vs @ % ; P < @ ) , and @ months ( @ % vs @ % ; P = @ ) postoperatively .