Comparison on Visual Function after Implantation of an Apodized Diffractive Aspheric Multifocal or Monofocal Intraocular Lens

Purpose:To evaluate visual outcomes after implantation of an aspheric multifocal /intraocular lens.(MIOL).or an aspheric monofocal intraocular lens (IOL).Methods:This was a prospective nonrandomized study.During 3-months of post-operative follow-up,the following outcomes for SN6AD1 MIOL.(multifocal group).and SN60WF IOL (monofocal group) were compared:uncorrected (UDVA) and corrected (CDVA) distance visual acuity,uncorrected (UNVA) and distance-corrected (DCNVA) near visual acuity,Chinese character near visual acuity,uncorrected intermediate visual acuity (UIVA) under high (100% contrast) and low contrast.(10% contrast),UIVA for different IOL powers,and a quality-of-life questionnaire.Results:UNVA,DCNVA,and UIVA under high contrast in the multifocal group were significantly better than those in the monofocal group (P<0.05).UDVA,CDVA and UIVA under low contrast did not differ between groups at 63 cm and 100 cm (P >0.05).In most cases,Chinese character near visual acuity was significantly better in the multifocal group.(P < 0.05).UNVA and UIVA at 63 cm improved over time during 3 months post-operatively.Better UIVA was found in emmetropic and mild myopic eyes as compared to hyperopic ones.The patients in the multifocal group had a higher degree of satisfaction and performed better on near and intermediate tasks,although with greater complaints of visual disturbance.Conclusion:The SN6AD1 MIOL provides significantly better UNVA,DCNVA and UIVA under high contrast conditions,and better Chinese character near visual acuity.Patients receiving the SN6AD1 MIOL reported a better quality of vision in spite of more serious visual disturbances.Better UIVA was observed in emmetropic and mildly myopic eyes.