Assessment Of Clinical Effect Of Aspheric Intraocular Lens

Objective: To investigate the security and the efficacy of the visual performance after the implantation of aspheric intraocular lens (AIOL).Methods: 38 patients(60 eyes) who accepted phacoemulsification on cataract and IOL implantation were selected in Nobel Eye institute, Taipei, Taiwan between January and December, 2008; the study group with 30 eyes accepted phacoemulsification coupled with AIOL implantation with SN60WF IOL implanted, the control group with 30 eyes accepted phaco- emulsification coupled with spherical IOL implantation with SN60AT IOL implanted; the complications were observed during and after the surgery;uncorrected visual acuity(UCVA),best corrected visual acuity (BCVA) and IOL position, Z40 root mean square(Z40 RMS) and root mean square of all the high order aberration(RMSh) were examined. Three months after the surgery; simultaneously, the degree of satisfaction and the adverse visual symptoms such as glare, halo disturbance, poor night vision, and the comfort of nighttime driving for cases with driving experience, were investigated.Results: All cases were operated by the same experienced doctor, without any complication detected during and after the surgery. Three months after the surgical therapy, the slit-lamp microscope found no rota- tion; the UBM examination found the couple bands of IOLs in all cases were inside the bags; in the study group, there two eyes whose IOLs slightly offset while in the control group, there were three were. Three months after the therapy, there was no significant difference of UCVA and BCVA betw- een the two groups (P>0.05). In term of pupil diameter of both 3mm and 6mm, the Z40 RMS of the study group was significantly less than the control group(P<0.05),however, the difference of RMSh between the two groups was not significant(P>0.05). Three months after the operation, all values of Z40 RMS and RMSh in the eyes with pupil diameter of 6mm were higher than those of 3mm(P<0.05). The frequency of adverse symptoms in the study group was lower than the control group (P<0.05).The satisfaction rate in the study group was higher than the control group (χ2=4.356,P<0. 05). Furthermore, in the study group there were 6 cases with nighttime driving experience, 5 of whom felt comfortable while in the control group there were 5 cases, only 1 of whom felt comfortable.Conclusion: AIOL can improve the visual performance through reducetion of the sphereical aberration, particularly suitable for the cases with bigger pupils and those who in the dark surrounds.