**6. Conclusions**

Correcting the spherical aberration of the cornea by intraocular lenses may improve the visual outcome compared to standard spherical lenses. Especially patients with high aberrations after corneal refractive surgery may benefit from a reduction of the overall aberrations. However, the prospects for a 100% correction of SA or aiming to a residual SA of +0.1 μm are limited with respect to an ideal and stable IOL. Therefore, any generic or customized IOL concept pursuing an aberration correction of aberrations, such as astigmatism, spherical aberration, coma, etc. must be designed with a tolerance according to the average expected misalignment in normal eyes (approximately 0–0.3 mm decentration and 0–3 degrees of tilt) [40, 57]. Consequently, this likewise limits the correctability of some higher-order aberrations. Eyes after corneal refractive surgery usually show very high values of SA and require special attention in the planning of cataract surgery. While eyes after myopic refractive procedures might benefit from a negative SA IOL [22], eyes after hyperopic refractive procedures often show high-negative SA and would require an IOL with positive SA for compensation [23]. Due to the high variability of SA in cataract patients, the "one-size-fits-all" approach may only provide optimum correction for a small amount of patients. Therefore, customized intraocular lenses tailored to correct for the individual spherical aberration may provide a better solution for a wide range of patients.

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### **Author details**

Timo Eppig1,2\*, Jens Schrecker3 , Arthur Messner<sup>1</sup> and Achim Langenbucher<sup>2</sup>

1 AMIPLANT GmbH, Schnaittach, Germany

2 Institute of Experimental Ophthalmology, Saarland University, Homburg, Germany

3 Department of Ophthalmology, Rudolf-Virchow-Klinikum, Glauchau, Germany

\*Address all correspondence to: timo.eppig@uks.eu

© 2019 The Author(s). Licensee IntechOpen. This chapter is distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/ by/3.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

*Aberration Correction with Aspheric Intraocular Lenses DOI: http://dx.doi.org/10.5772/intechopen.89361*
