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Related Experiment Video

Updated: Jun 24, 2026

Implantation Protocol of the Foldable Capsular Vitreous Body for Complex Vitreoretinal Surgery

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Published on: April 14, 2026

Modulation transfer function: rigid versus foldable phakic intraocular lenses.

José M Artigas¹, Cristina Peris, Adelina Felipe

¹Fundación Oftalmológica del Mediterráneo, Departamento de Optica, Facultad de Física, Universidad de Valencia, Valencia, Spain. jose.artigas@uv.es

Journal of Cataract and Refractive Surgery

|March 24, 2009

Summary

Phakic intraocular lenses (pIOLs) slightly reduce monofocal IOL modulation transfer function (MTF). Rigid pIOLs offer better optical performance than foldable ones, with injection stress effects on foldable pIOLs resolving within two hours.

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Area of Science:

Ophthalmology
Optical Engineering

Background:

Phakic intraocular lenses (pIOLs) are implanted in the anterior chamber to correct refractive errors.
Assessing the optical quality impact of pIOLs on existing intraocular lenses (IOLs) is crucial for patient outcomes.

Purpose of the Study:

To evaluate the modulation transfer function (MTF) changes in a monofocal IOL when a pIOL is added.
To compare the MTF of a rigid Artisan pIOL versus a foldable Artiflex pIOL.
To assess the temporal MTF recovery of the foldable pIOL post-injection.

Main Methods:

Utilized an eye model adhering to British and EN-ISO standards.
Measured MTF using the Opal Vector System across various pupil sizes (2.0-5.0 mm).
Employed a 28.00 D monofocal IOL and two -9.00 D pIOLs (rigid and foldable).

Main Results:

The rigid pIOL demonstrated slightly superior MTF compared to the foldable pIOL across all pupil sizes.
Both pIOLs maintained good optical quality relative to the monofocal IOL alone.
Optical effects from the foldable pIOL's injection diminished within 2 hours.

Conclusions:

Anterior chamber pIOL implantation causes a minor reduction in monofocal IOL MTF.
The rigid pIOL exhibited better optical performance than the foldable pIOL.
The foldable pIOL's optical quality was unaffected long-term by injection-related mechanical stress.