Abstract:AIM: To investigate the compensation effects of internal higher-order aberrations(HOAs)on the corneal HOAs in youth with low and moderate myopia.
METHODS: Seventy-six myopic patients(152 eyes)who received corneal refractive surgery from April to May in 2012 were included in this study. The HOAs of the anterior corneal surface and the total ocular HOAs(3-6 stage)ocular were measured using OPD Scan ARK-10 000. The root mean square values(RMS)of total HOAs, total coma(TC), total trefoil(TT)and total spherical aberration(TS)and Zernike terms of Z3-1, Z31, Z3-3, Z33, Z40 of a pupil with a diameter of 6mm were recorded to calculate the compensation factor.
RESULTS: The corneal spherical aberration were positive in all eyes, but ocular spherical aberration were negative in 33 eyes(21.7%); The RMS values of corneal TC and Zernike terms of corneal Z3-1, Z31 were smaller than the ocular aberration. and their CFs were negative; The RMS values of corneal HOAs, TT, TS and Zernike terms of corneal Z3-3, Z33, Z40 were higher than the ocular aberration and their CFs were positive.
CONCLUSION: Theintraocular HOAs mainly manifest compensation effect on the HOAs of the cornea; The intraocular spherical aberration compensates for the spherical aberration of cornea,which can reduce the ocular spherical aberration; The effects of intraocular coma and trefoil on corneal higher order aberrations vary widely and show partial compensation, overcompensation and superposition among subjects. The main role of coma is superposition, while that of trefoil mainly manifest as compensation action.
