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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 of the cases, Chinese character near visual acuity was significantly better in the multifocal group (P<0.05). UNVA and UIVA at 63cm were improved 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.