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Spatio-chromatic vision with multifocal diffractive intraocular lens.

Maria S Millan1, Laura Clavé2,3, Aurora Torrents2

  • 1Applied Optics and Image Processing Research Group, Universitat Politècnica de Catalunya-BarcelonaTech, C/ Violinista Vellsolà, 37, Terrassa, 08222, Barcelona, Spain. m.millan@upc.edu.

Eye and Vision (London, England)
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Summary

Multifocal intraocular lenses (IOLs) create vision differences based on light color and distance. This asymmetry in pseudophakic vision is linked to the lens design and energy efficiency, not just chromatic aberration.

Keywords:
Diffractive lensEnergy efficiencyLongitudinal chromatic aberrationModulation transfer functionMultifocal intraocular lensPresbyopia-correcting intraocular lensSpatio-chromatic visionVisual acuity

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Area of Science:

  • Ophthalmology
  • Optics
  • Vision Science

Background:

  • Multifocal diffractive intraocular lenses (IOLs) are widely used for pseudophakic vision correction.
  • Understanding their impact on spatio-chromatic vision is crucial for patient outcomes.

Purpose of the Study:

  • To detect and interpret alterations in pseudophakic vision caused by multifocal diffractive IOLs.
  • To physically interpret the spatio-chromatic vision changes observed.

Main Methods:

  • In vitro characterization of two diffractive IOLs (AT LISA Tri and FineVision) using red, green, and blue light.
  • Analysis included energy efficiency (EE), modulation transfer function, longitudinal chromatic aberration (LCA), and halo intensity.
  • In vivo visual acuity (VA) assessment in pseudophakic subjects under varying light conditions and distances.

Main Results:

  • Clinical VA correlated with predicted values under white light for both IOLs.
  • Longitudinal chromatic aberration (LCA) effects were compensated at near but noticeable at far distances.
  • A significant asymmetry in visual resolution was observed based on object distance and illumination wavelength, with red light favoring far vision and blue light favoring near vision.

Conclusions:

  • Diffractive multifocal IOLs induce spatio-chromatic vision asymmetries beyond simple LCA.
  • Clinically detectable visual acuity asymmetry for far/near distances under red and blue light exists.
  • This asymmetry is primarily driven by the wavelength-dependent energy efficiency of the IOLs, not solely by defocus.