Trifocality Achieved Through Polypseudophakia: Optical Quality and Light Loss Compared With a Single Trifocal...

Area of Science:

• Ophthalmology
• Optical Engineering
• Biomedical Optics

Background:

• The development of advanced intraocular lens (IOL) technologies aims to improve visual outcomes after cataract surgery.
• Trifocal IOLs offer correction for multiple focal distances, but their performance and adaptability are areas of ongoing research.
• A two-IOL system presents an alternative approach to achieving multifocality.

Purpose of the Study:

• To compare the optical performance of a two-IOL system against a single capsular bag trifocal IOL.
• To evaluate the impact of misalignment on the optical quality of the two-IOL system.
• To assess light transmission through the two-IOL configuration.

Main Methods:

• In vitro comparison of a two-IOL system (monofocal + supplementary trifocal) with a single trifocal IOL using an optical metrology device.
• Assessment of optical quality via the area under the modulation transfer function (MTF).
• Testing the effect of supplementary lens misalignment (decentration and tilt) and measuring light loss.

Main Results:

• The two-IOL system demonstrated three focal peaks comparable to the single trifocal IOL.
• MTF areas were similar across configurations for far, intermediate, and near vision, with slight differences observed.
• The supplementary lens showed minimal impact from moderate decentration (up to 0.6 mm) and tilt (5°), with only a 1.3% decrease in optical power.

Conclusions:

• The optical quality of the two-IOL system is comparable to that of a single trifocal IOL.
• The supplementary low-power IOL exhibits significant tolerance to misalignment and minimal light attenuation.
• The reversible nature of the two-IOL system may offer distinct clinical benefits.