·AIM:To analyze the relationship between visual fatigue and range of fusion after laser in situ keratomileusis(LASIK)in myopia patients,and with fusion function training by synoptophore to improve visual fatigue after LASIK surgery.·METHODS:Totally 60 myopia cases 120 eyes,whose diopters were from-1.50D to-8.00D,were determined the fusion range by synoptophore and visual fatigue questionnaire survey was conducted before LASIK.After LASIK patients were divided randomly into two groups:Group A with 30 days fusion function training by synoptophore;group B with out fusion function training,respectively,after 1 week and 1 month the fusion range was determined and visual fatigue questionnaire survey was conducted,statistical analysis was performed.·RESULTS:Group A and group B were with reduced scopes of fusion range postoperatively,which were statistically significant.1 week after operation,the scopes of fusion range in the two groups were 18.58±8.91 and 13.45±8.87,which were statistically significant(P < 0.05),1 month after operation,the scopes of fusion in the two groups were 20.55±7.23 and 18.12±6.10,which weren’t statistically significant.1 week postoperatively,visual fatigue of group A scored 3.92±1.65,group B scored 5.16±2.34 the difference of which was statistically significant(P<0.05),1month postoperatively,the scores were 1.28±0.96 and 1.45±0.99,the difference wasn’t statistically significant.·CONCLUSION:Decreased fusion function after LASIK surgery is an important factor of visual fatigue.Early postoperative functional training of fusion can effectively improve visual fatigue symptoms.·