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Aspheric aberration-correcting IOL leads to enhanced visual acuity, depth of focus, contrast sensitivity

Issue: November 10, 2017

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Thomas Neuhann

LISBON, Portugal — Implantation of a new aspheric IOL that allows individual correction of corneal spherical aberration showed superior results when compared with an identical design aspheric aberration-neutral IOL in a study.

The results of 92 cataract patients implanted with the Individua-aA IOL (HumanOptics) were compared with those of a control group of 41 patients implanted with the Aspira-aA (HumanOptics). The two groups had comparable basic characteristics, with a wide variability of spherical aberration between 0.1 µm and 0.7 µm but similar mean values in both groups.

“We reduced spherical aberration to the minimum in the Individua group with the consequence that the patients in this group achieved a significantly higher distance visual acuity uncorrected and corrected, a significantly higher contrast sensitivity at nearly each spatial frequency, a significantly higher visual acuity and a significantly wider depth of field, with +0.50 to +2.00 of defocus,” Thomas Neuhann, MD, said.

He said that more depth of focus has to make use of more aberrations and takes a toll on modulation transfer function (MTF). These results, however, show that depth of focus can also be obtained with minimization of aberrations and optimization of MTF.

“Physics is right, but vision is more than physical optics, it is physiological optics. Neurophysiological image processing is a major part of good vision with depth of focus. Therefore, higher depth of focus can come with higher MTF than normal,” Neuhann said. – by Michela Cimberle

Reference:

Neuhann T, et al. Customized patient care: first clinical outcomes with a novel monofocal intraocular lens for individual spherical aberration correction. Presented at European Society of Cataract and Refractive Surgeons meeting; Oct. 7-11, 2017; Lisbon, Portugal.

Disclosures: The authors report no relevant financial disclosures.