AIM:To value the accuracy of Wavescan aberrometer in measuring refractive errors for myopic eyes.METHODS:Sixty-six eyes of 33 patients were divided into three groups :mild myopia(-0.50～-3.00D)17 eyes,moderate myopia(-3.00～-6.00D)27 eyes and high myopia(-6.00D～)22 eyes based on measurement with autorefractor after cycloplegia and non-cycloplegia.Same examination was made in all the patients using Wavescan aberrometer and the results were statistically compared between the two measurements with paired t-test.RESULTS:There was no significant difference in spherical and cylinder refraction between manifest refraction and Wavescan aberrometer in low and high myopia group(P=0.289,P=0.814,P=0.057,P=0.246);there was no significant difference in spherical and cylinder refraction between cycloplegia refraction and Wavescan aberrometer among low myopic,moderate myopic and high myopic eyes.Wavescan aberrometer and autorefractor after cycloplegia decreased with the increasing degrees of myopia.However this matching rate in cylinder increased with the increasing degrees of myopia.CONCLUSION:Wavescan aberrometer,as an assistant modality of VISX STAR S4 LASIK system,is highly accurate in refractive measurement.There are still some differences between Wavescan aberrometer and autorefractor after cycloplegia.