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Aspheric lens shows similar MTF measurements to young phakic eyes in trial

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SAN FRANCISCO — When compared with young phakic eyes, a new aspheric lens implanted after cataract surgery provided statistically similar visual outcomes for spherical aberrations.

"The Invent ZO optic has been designed to provide the same amount of aberrations as the natural young crystalline lens," Paolo Vinciguerra, MD, said at the American Society of Cataract and Refractive Surgery meeting here. "It is easy to insert and has good tolerance in terms of IOL stability, refraction, visual symptoms."

Dr. Vinciguerra reported on 6-month implantation results of the Invent ZO (Carl Zeiss Meditec) in a multicenter trial in Europe. The study had a sample size of 53 patients who were 55 years and older, and a control group of 97 young phakic eyes.

The performance of eyes that had implantation of the lens was compared with phakic young eyes for outcomes, including modulation transfer function (MTF) measurements of higher-order aberrations and Zernike spherical aberrations at two separate pupil diameters.

The study found no clinically relevant difference between the two groups for MTF measurements, Dr. Vinciguerra said.