Monochromatic aberrations of postLASIK eyes, which are categorized into starburst group, doublevision group, moisture group and reference group according to their visual symptoms, are measured. The rootmeansquare (RMS) value of the third and the fourth-order aberrations from the starburst group and moisture group are larger than the counterparts from the reference group. The modulation transfer function (MTF) of the first three groups is obviously lower than that of the reference group. It is found that in daytime, the fourth-order aberrations, especially the symmetrical Zernike spherical aberration, have more effects on the modulation transfer function, while the effects of the third-order aberrations, especially the asymmetrical Zernike coma, on MTF are more important at night. Higher-order aberrations above the fourthorder still affect the eyes suffered from visual symptoms, whereas no evident effect on eyes of the reference group is found. RMS and MTF are effective ways to study the visual symptoms after surgery.