Abstract:AIM:To evaluate the effects of total and corneal of astigmatism on laser in situ keratomileusis(LASIK)correction of myopic astigmatism.METHODS:Totally 162 eyes of 84 patients who underwent primary LASIK for myopic astigmatism were reviewed retrospectively.Based on the differences between total and corneal axis of astigmatism and degrees,the patients were divided into two groups:A group(112 eyes)with difference of astigmatism<15° or degrees of total astigmatism<twice the corneal astigmatism,B group(50 eyes)with difference of astigmatism≥15° or degrees of total astigmatism≥twice the corneal astigmatism.The corrective effects and visual between total and corneal astigmatism were analyzed.RESULTS:Total astigmatism of eye was 69% determined by astigmatism of cornea.The difference in the total and corneal axis of astigmatism was<15°.After LASIK,the degree of astigmatism measured in A group was(-0.39±0.43)D,B group(-0.73±0.21)D.There was difference of astigmatism measurement between two groups(P<0.05).There were 4 patients who complainted spin in night of assort near vision and tiredness.CONCLUSION:Positive correlation was found between total and corneal astigmatism.Before LASIK correction of myopic astigmatism,we should choose reasonable cutting output and axis of astigmatism by optometry and corneal topography and make individual treatment.
