Optical design and performance of a trifocal sinusoidal diffractive intraocular lens

Area of Science:

• Ophthalmic optics
• Biomedical engineering
• Diffractive optics

Background:

• Trifocal intraocular lenses (IOLs) aim to restore vision at multiple distances.
• Understanding diffractive profile models is crucial for IOL design and performance.
• The Acriva Trinova IOL is a commercially available trifocal IOL with a claimed sinusoidal diffractive profile.

Purpose of the Study:

• To analyze two theoretical sinusoidal diffractive profile models for trifocal IOLs.
• To compare the topographic features and energy efficiency (EE) of these models with experimental data.
• To validate a theoretical model against experimental measurements of a specific trifocal IOL.

Main Methods:

• Theoretical analysis of two sinusoidal diffractive profile models.
• Confocal microscopy to measure the topography of the Acriva Trinova IOL.
• Through-focus energy efficiency measurements using a model eye setup.

Main Results:

• The experimental topography and energy efficiency of the Acriva Trinova IOL closely matched one theoretical model, the "optimum triplicator".
• Accurate matching required introducing a spatial shift in the sinusoidal profile of the theoretical model.
• Differences were observed in topographic features like shape, step height, and radii between models.

Conclusions:

• The "optimum triplicator" sinusoidal diffractive profile model, with a spatial shift, accurately predicts the performance of the Acriva Trinova trifocal IOL.
• This validated model can aid in the design and optimization of future trifocal IOLs.
• Experimental validation is essential for confirming theoretical models in IOL development.