AIM: To evaluate the early comprehensive visual quality of patients with myopia after laser in situ keratomileusis(LASIK), and to explore the application value of double-pass optical quality analysis system(OQAS)in the evaluation of visual quality.

METHODS: A total of 48 cases(96 eyes)with myopia patients were selected our hospital Sep. 2014 to Sep. 2015. All patients of femtosecond LASIK was examined by a dual channel system(OQAS). A total of four time points of Strehl ratio(SR), modulation transfer function cut-off spatial frequency(MTF cutoff), intraocular objective scattering index(OSI)of patients were recorded preoperatively and postoperatively 1wk, 1mo, 3mo. The early visual acuity was analyzed and evaluated before and after operation.

RESULTS: After the 3mo, MTF cutoff spatial frequency is better than preoperative(P<0.05). OSI in postoperative 1wk and 1mo were higher than that in preoperative(P<0.05). But it recovered to the preoperative level at 3mo after the operation. SR, OSI linear correlation and MTF cutoff spatial frequency correlation were analyzed by Pearson linear correlation. They showed that both SR and OSI were significantly related to MTF cutoff spatial frequency(P<0.05).

CONCLUSION: The postoperative visual acuity of femtosecond LASIK recover fast. It's effective and safety. MIT cutoff spatial frequency, SR and OSI results can be used as a comprehensive index to evaluate the clinical postoperative visual acuity.