AIM:To evaluate the effects of patients with various intended residual refractive power on LASIK surgery.METHODS:The 486 eyes with simple refractive errors were studied postoperation of LASIK.All cases were divided into groups Ⅰ,Ⅱand Ⅲ according to the intended residual refractive power.In group Ⅰ:219 eyes were corrected completely,in group Ⅱ:215 eyes were uncorrected-0.25 diopter(D),In group Ⅲ:52 eyes were uncorrected-0.50D.The visual acuity and spherical e-quivalent refraction after operation were examined.All patients were followed at least 6 months.RESULTS:There were no significant differences between uncorrected visual acuity (UCVA) after operation 1month and3,6 months and preoperation best-corrected visual acuity (BSCVA) in all groups.Spherical equivalent refraction after operation:There were significant differences between after operation 1 month and 3 months,1 month and 6 months in every group (P<0.05);There were no significant differences between after 3 months and 6 months;There were no significant differences between Ⅰand Ⅱgroup after 3 and 6 months;There were significant differences between Ⅲand Ⅰ,Ⅲ and Ⅱgroup after 3 and 6 months(P<0.05).CONCLUSION:It does not obviously influence the UCVA and refractive power for patients with preoperation uncorrected-0.25D after operation 6 months on LASIK.It has an influence to refractive power for patients with preoperation uncorrected-0.50D after operation 3 months on LASIK.