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PAL - Precision Aspheric Lens
PAL represents the next generation in aspheric optics. First generation aspheric IOLs are generally designed to compensate for corneal aberrations only when the lens is centered. Unfortunately clinically-occurring lens decentration and tilt are fairly common, and can cause these types of lenses to perform worse than a spherical lens under the same degree of misalignment. This is why PAL optic design takes into acoount a broad range of aberrations arising with lens misalignment. Consequently, PAL lenses enable better image quality under real world conditions.