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Aspheric IOLs compensate similar to a young, natural lens, study shows

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ALICANTE, Spain — Aspheric IOLs have the ability to reduce spherical aberration and to compensate for coma in a similar way as a young phakic eye, according to a study carried out in Germany.

"A previous study by Tabernero et al demonstrated that in the young eye we have a natural compensation for corneal coma at [the] lens' level. The so-called angle K, which is the difference between the line of sight and the pupillary axis, is reversed and therefore compensated at the lens level," Hakan Kaymak, MD, said at the Alicante Refractiva International meeting here.

In their study, Dr. Kaymak and colleagues used a new device called a Purkinje meter, which was developed by Franck Schaeffel of Tübingen, Germany. The researchers found that aspheric IOLs not only significantly reduce spherical aberration and increase contrast sensitivity compared with spherical lenses, but they also compensate for coma aberration in cases of slight tilt or decentration.

"We tested this ability with the AcrySof IQ lens (Alcon), with the new Tecnis one-piece (Advanced Medical Optics), with the aspherical Hoya and Acri.Tec 35A, and found no significant difference between these models," Dr. Kaymak said.