1. Binocular Defocus Curve of Apodized Diffractive Multifocal IOL in Asian-Indian Eyes Dr.A. Shetty; Dr. M. K. Kummelil; Dr. S.Nagappa Cataract and Refractive Lens Surgery Services Narayana Nethralaya,Bangalore,India No Financial Disclosure

2. Purpose To study the Binocular Defocus Curve and its implications for an apodized diffractive Multifocal IOL (MFIOL)

3. Materials and Methods 15 patients who had undergone bilateral implantation of RESTOR 3+ multifocal IOL were included. BSCVA for distance was estimated by subjective refraction at the end of 6 weeks post op.

4. Materials and Methods The best spectacle correction was placed in the trial frame. Trial lenses ranging in power from +2 to 6 D were placed serially in front of both eyes in 1D increments. Distance vision was recorded for each set of trial lenses

5. Materials and Methods A defocus curve was obtained by plotting the mean binocular visual acuities against 9 values of defocus (ranging from + 2.0 to - 6.0 D in 1 D steps).

6. Results 30 eyes of 15 patients Best Corrected Visual Acuity(Decimal Scale) - – BCDV was 0.94 + 0.13 – IDV was 0.53 + 0.17 – BCNV was 0.97 + 0.08

8. Results –Binocular Defocus Curve The mean visual acuity improved from 0.522 logMAR with +2D to 0.0 logMAR with plano. It dipped to 0.221logMAR with -1 and -2D Improved marginally to 0.176logMAR with -3 D when the near add was neutralized. Dipped to 0.954logMAR with -6 D.

9. Conclusion The minimal dip of the defocus curve suggests good range of vision and reasonable intermediate vision in patients implanted with the RESTOR 3+ multifocal IOL.