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Intraocular lens with heterogeneous refractive index correcting field and chromatic aberrations


Purpose : Current monofocal intraocular lenses (IOLs) may incorporate toric and aspheric surfaces for astigmatism and spherical aberration correction. We propose an alternative IOL design with spatially variable refractive index for the additional correction of field and chromatic aberration.

Methods : Ray-tracing techniques were used to optimize the optical performance of customized eye models incorporating the IOL. Realistic values of both refractive index and chromatic dispersion currently found in IOLs’ acrylics were incorporated. Computer assisted optimization techniques were applied for the IOL design in order to correct aberrations in an extended retinal area up to 15 degrees. The optical benefit of the IOL in the presence of high order aberrations from real eyes’ data was also studied.

Results : The appropriate spatial combination of different refractive indexes/dispersion in a single IOL provided correction of the ocular aberrations. Both off-axis and chromatic aberration are compensated up to residual values below 5 % as compared with phakic eyes. Transverse chromatic aberration was also minimized in the selected retinal areas. The use of aspheric surfaces allowed for the correction of symmetrical high order aberrations. A tolerance analysis showed that the benefits in optical quality of the IOL were maintained for common values of decentering and tilt found in the pseudophakic eye.

Conclusions : A new single IOL design incorporating spatially variable refractive index and dispersion properties has been proposed. Ray-tracing predictions showed a superior image quality due to the combined correction of chromatic, spherical and off-axis aberrations without the need of diffractive profiles that may increases scattered light.

This is an abstract that was submitted for the 2016 ARVO Annual Meeting, held in Seattle, Wash., May 1-5, 2016.

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