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New sinusoidal optic trifocal lens provides smooth, continuous vision
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VIENNA — A novel trifocal lens with a sinusoidal surface profile provides smooth, continuous vision, minimizing glare and halos, according to one surgeon.
“This lens turned upside down all my knowledge about trifocal patterns because there are no diffractive steps but one very continuous, smooth sinusoidal structure. Yet, we still get the trifocal effect,” Pavel Stodulka, MD, PhD, said at the European Society of Cataract and Refractive Surgeons meeting.
In his center, he performed a study in which 10 patients undergoing bilateral femtosecond laser-assisted cataract surgery were implanted with the sinusoidal Acriva Trinova (VSY Biotechnology) in one eye and the classical sharp-edge optic trifocal FineVision PhysIOL in the fellow eye. Implantation was equally distributed in dominant and nondominant eyes. Patients were followed for 3 months.
“Uncorrected distance vision was very similar with the two lenses, but the Trinova ended up a little more on the myopic side, with a mean of –0.42 D at 3 months. Uncorrected intermediate vision was comparable, with slightly better outcomes for the Trinova. Uncorrected near performance was slightly worse with the Trinova, but both groups achieved J1. Distance corrected near vision was where the Trinova had lower outcomes, and this was the only significant difference we found in this series,” Stodulka said.
Defocus curves were similar, showing high quality at all distances. Contrast sensitivity was within the normal range. All patients perceived mild halos and glare in both eyes, but no one graded it as severe. The sinusoidal IOL tended to induce a lower grade of halo and glare.
“The residual refractive error with this lens was a surprise, but all patients tolerated it well, even those with residual refraction up to –0.75 D. None of them required laser correction, while eyes with the classical trifocal optic did require laser with residual refraction over –0.25 D,” Stodulka said. – by Michela Cimberle
Reference:
Stodulka P. Clinical results of implantation of the new sinusoidal trifocal lens Presented at: European Society of Cataract and Refractive Surgeons meeting; Sept. 22-26, 2018; Vienna.
Disclosure: Stodulka reports no relevant financial disclosures.