Defocus Curves and Intermediate Vision in Multifocal Diffractive IOL With Adjusted Apodization
Purpose
To report the results of defocus curves and intermediate vision with a new apodized diffractive IOL in which the apodization was adjusted to benefit intermediate vision and comparison with defocus curves of other multifocal IOLS as reported in the literature.
Methods
in 20 eyes of 10 patients implanted with the SeeLens MF apodized diffractive multifocal IOL (Hanita lenses, Israel), defocus curves from +3.5 to -5 D, refraction, uncorrected and corrected distance, intermediate and near vision were measured and analyzed. These outcomes were compared to results reported in the literature of trifocal IOLs.
Results
Uncorrected distance visual acuity (UDVA) was -0.04+0.09 logMAR, corrected distance visual acuity (CDVA) was -0.12+0.05, mean spherical equivalent refraction (SE) was +0.02D+0.44.
Maximal reading acuity was achieved at a defocus of -2.5 (40cm) with a logMAR of -0.04+0.08. At a defocus of -1.5 D (67cm) the mean visual acuity was 0.16+0.15 logMAR, and at -2.0D (50 cm) the mean visual acuity was 0.01+0.11 log MAR.
These results are better than those reported in the literature for trifocal IOLs, were the maximal distance, near and intermediate are less.
Conclusion
The apodized diffractive multifocal IOL with an optimized diffractive function and apodization allows for excellent uncorrected visual acuity, also in the intermediate range. Depending on whether intermediate vision is defined as 0.67m (computer distance) or 1m distance, either the bifocal MFIOLs or the trifocal multifocal IOLs perform better.