Volume 5 Issue 5
Oct.  2012
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RAO Feng. Design of multi-focus intraocular lenses[J]. Chinese Optics, 2012, 5(5): 485-492. doi: 10.3788/CO.20120505.0485
Citation: RAO Feng. Design of multi-focus intraocular lenses[J]. Chinese Optics, 2012, 5(5): 485-492. doi: 10.3788/CO.20120505.0485

Design of multi-focus intraocular lenses

doi: 10.3788/CO.20120505.0485
  • Received Date: 12 Jun 2012
  • Rev Recd Date: 15 Aug 2012
  • Publish Date: 10 Oct 2012
  • The Liou-Brennan eye model is constructed using the optical design software ZEMAX. The Depth of Focus(DOF), extended Intraocular Lenses(IOL) that includes aspherical IOL, refractive multifocal IOL and diffractive multifocus IOL are included in the design. The optical performance of the pseudophakic eye for the designed IOLs is analyzed for both the spot diagram and visual acuity. For the pseudophakic eye with a 3 mm pupil, when the spherical aberration is fully corrected by the aspherical IOL, the best visual acuity reaches 1.2 with a DOF of only 1.4 m-1. When the spherical aberration is 0.4, the best visual acuity is 0.9 with a DOF as high as 2.2 m-1. With the implantation of refractive or diffractive multifocus IOLs, the pseudophakic eye has fairly good distant and near vision, while the intermediate vision is lower than 0.5. Diffractive multifocal IOL allows 81% input energy to image and the energy distribution is not affected by the pupil size. The energy distribution of the refractive multifocal IOL is dependent on the pupil diameter. The aspherical IOL, refractive multifocal IOL and diffractive multifocal IOL can extend DOF after surgery. However, they all have advantages and disadvantages, which should be taken into consideration under clinical conditions.

     

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