Analysis of higher order aberrations in myopic eyes

Objective To analyze the distribution of the higher order aberrations myopic eyes and observe the influences of the degree of myopic and age in higher aberrations. Methods Using the Allegretto wave analyzer, 186 myopic eyes were evaluated before LASIK. The root mean square (RMS) values of higher order aberrations for each case with pupil dilated were calculated. The subjects were divided into following groups: low myopia group(≤- 6.00 D), high myopia group(-6.00 D);youth group(18-30 years old), middleage group(31-39 years old). Results RMS values was decreased from third to sixth order aberrations in the population, coma and spherical aberrations were the chief higher order aberrations, other order aberrations were nearly zero. There were no difference in right eye and left eye(P0.05) ,also with age between the groups (P 0.05). But there were significant differences in myopic groups but coma and secondary spherical aberration (P 0. 05 ). Conclusion The chief higher order aberrations were coma and spherical aberrations, in particular the coma. In high myopia the spherical aberrations is larger than low myopia.