Comparison of higher-order aberrations between implantations of aspherical intraocular lens and spherical intraocular lens / 眼科

ABSTRACT

Objective To compare intraindividual higher-order aberrations(HOA)after implantation of aspherical and spherical intraocular lenses(IOL).Design Prospective,case-controlled study.Participants 33 patients(66 eyes)were between 50 and 76 years of ages.The patients with bilateral senile cataracts were operated with phacoemulsification and IOL implantation.All the patients had no other ocular pathologies and no previous ophthalmic surgery.Patients with keratometric astigmatism higher than-2.0 diopters(D)were excluded from the study.Methods Wavefront aberration measurements of 33 patients(66 eyes)after implantation of a spherical IOL(Canon Staar KS-3)in one eye and an aspherical IOL(Cannon Staar KS-3Ai)in the contralateral eye were analyzed.The eyes were randomly assigned to groups of the spherical IOL or the aspherical IOL.Third-order,4th-order,5th-order,total HOA root-mean-squares(RMS),and 4th-order spherical aberrations(Z40)were compared 3 months after surgery.Main Outcome Measures Visual acuity(VA),the best corrected visual acuity(BCVA),the centrality of IOL,refraction data,diameter of pupil size,3rd-order,4th-order,5th-order and total HOA RMS,and 4th-order spherical aberration(Z40)RMS were measured.Results Fourth-order aberration RMS(0.193?0.098?m),Z40 RMS(0.037?0.099?m),total HOA RMS(0.498?0.072?m)in the aspherical IOL group were lower than those with the spherical IOL(0.403?0.155?m,0.381?0.142?m,0.737?0.164?m,respectively)at 6mm pupil diameter.For 3rd-and 5th-order RMS at 6mm pupil diameter,total HOA RMS(at 5mm pupil diameter),no significant difference was found in both IOLs.Under mesopic conditions,ten patients(30%)with an aspheric IOL had better contrast sensitivity.The average myopic shift were(-0.29?0.09)D and(-0.87?0.16)D in the aspherical and spherical IOL groups at 6mm pupil diameter(P