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| Spanning the spectrum of optical excellence |
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Restoring the ocular transparency and emmetropization after cataract removal are not the only goals for the IOL implantation. We should also bring the eye back to the optical quality that it had in the past when it was phakic and young. Many studies conducted in pseudophakic patients have shown that the spherical geometry of an IOL is not the optimal geometry. This is because spherical IOLs induce positive spherical aberrations (+SA) that add to the cornea SA resulting in a loss of contrast sensitivity especially for mesopic vision conditions and large pupil diameters. Aspheric IOLs have been designed not to induce +SA or even to compensate the +SA of the cornea and restore high quality visual function. In developing its aspheric lenses (600), Carl Zeiss brought together the best of both worlds in combining the advantages of negative SA lenses and aberration-neutral lenses to achieve maximum visual quality for largest range of patients. | |
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