Corneal haze of any grade was less common in MMC-PRK compared to PRK at 1 month ( 21.4 % vs 31.0 % ; P < .01 ) and 3 months ( 12.8 % vs 35.9 % ; P = .03 ) postoperatively ; it was also less common in MMC-PRK compared to LASEK at 1 month ( 21.4 % vs 55.9 % ; P < .01 ) , 3 months ( 12.8 % vs 42.4 % ; P < .01 ) , and 6 months ( 12.2 % vs 36.4 % ; P = .03 ) postoperatively .