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Aspheric IOLs: The Next Generation

One type of 1ST GENERATION aspheric IOL is designed with a prolate aspheric surface to compensate for corneal aberrations when the lens is centered. Because the optics of these lenses are optimized for a centered position, they can perform poorly if they become decentered or tilted - often to the point of performing worse than a spherical lens under the same degree of decentration.

Unfortunately, clinically occurring lens decentration and tilt are common occurrences. Even the typical human eye itself, is not optically symmetrical. Aaren Scientific recognizes this, and has designed its PAL optics to represent the NEXT GENERATION of aspheric lenses. PAL optic design takes into account a broad range of aberrations arising with lens misalignment. Its aspheric surface is non-prolate which physically distinquishes its shape from 1st generation aspherics. Consequently, Aaren's PAL lens enables better image quality under a variety of real world conditions.

MTF Comparison charts

* Best focus defined at 3mm aperture prior to determining MTF at 5mm.

MTF (Modulation Transfer Function) analysis shows the significantly improved image quality of an Aaren PAL aspheric hydrophilic lens to a typical aspheric lens, under various degrees of decentration and tilt. In addition, the MTF of PAL is comparable to or better than that of a spherical optic in cases of significant lens decentration and tilt.