Comparison of the Polychromatic Image Quality of Two Refractive-Segmented and Two Diffractive Multifocal Intraocular...

Area of Science:

• Ophthalmology
• Optical Engineering
• Biomedical Optics

Background:

• Evaluating multifocal intraocular lenses (MIOLs) in vitro is critical for optimizing patient surgical outcomes.
• Previous optical bench studies predominantly used monochromatic light, overlooking longitudinal chromatic aberration (LCA) effects in refractive MIOLs.

Purpose of the Study:

• To assess the impact of chromatic aberration on the performance of refractive extended depth of focus intraocular lenses (IOLs).
• To compare the through-focus modulation transfer function (TF-MTF) and point spread function (PSF) of refractive and diffractive IOLs under polychromatic light.

Main Methods:

• Evaluated two refractive segmented extended depth of focus IOLs (Femtis Comfort, Precizon Presbyopic) and two diffractive IOLs (AcrySof IQ ReSTOR, FineVision Pod F).
• Conducted TF-MTF and PSF measurements using both monochromatic and polychromatic light on a customized optical bench.

Main Results:

• Refractive IOL designs showed distinct haloes in their point spread functions.
• Opposite signs of longitudinal chromatic aberration were observed between refractive and diffractive IOLs at near foci.
• Performance differences were noted when comparing IOLs under monochromatic versus polychromatic light conditions.

Conclusions:

• The optical design of IOLs critically influences performance under polychromatic light.
• Chromatic aberration significantly affects MIOL performance, necessitating consideration during lens selection.
• Findings provide valuable data for vision care professionals selecting suitable IOLs for patients.