Geometric-phase intraocular lenses with multifocality.

Area of Science:

• Ophthalmology
• Materials Science
• Optics

Background:

• Conventional multifocal and extended depth of focus (EDOF) intraocular lenses (IOLs) often present challenges like blurred vision and photic phenomena.
• Existing IOL designs may require additional surface patterns, complicating manufacturing and potentially impacting visual quality.

Purpose of the Study:

• To demonstrate a novel type of multifocal and EDOF intraocular lens (IOL) utilizing geometric phase (GP) lens layers.
• To evaluate the performance of GP-modulated IOLs compared to conventional diffractive IOLs.
• To explore the potential of GP IOLs to mitigate common visual disturbances associated with multifocal IOLs.

Main Methods:

• Fabrication of bifocal and trifocal GP IOLs using UV-curable liquid crystal polymers with radially aligned anisotropic orientation.
• Embedding μm-thin geometric phase (GP) lens layers into IOL designs.
• Characterization of GP IOLs through analysis of defocus images and modulation transfer functions.

Main Results:

• GP-modulated IOLs demonstrate superior multifocality compared to conventional diffractive IOLs.
• The number of foci and light splitting ratio can be precisely controlled by adjusting the number and thickness of stacked GP layers.
• GP IOLs avoid the need for additional surface patterns found in standard monofocal IOL designs.

Conclusions:

• GP IOLs represent a promising advancement in intraocular lens technology.
• These lenses have the potential to significantly reduce visual side effects such as blurred vision and photic phenomena.
• GP IOLs offer a simplified design approach while enhancing visual performance for cataract surgery patients.