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History of IOLs that correct spherical aberration

In a recent review article,¹ the potential visual benefit of aspheric intraocular lenses (IOLs) was addressed. Unfortunately, the historical context of the development of this important technology was not properly covered. In my opinion, the article failed to cite the relevant literature on the basics of aspheric IOLs and their theoretical limitations. This may prevent the readers from a complete and accurate view of the problem. As one of the individuals directly involved in the development of the first aspheric IOL,² together with Sverker Norrby and Patricia Piers, I would like to briefly summarize how this development actually happened. The initial concept of an IOL to correct the spherical aberration of the cornea came from a better understanding of the nature of the optical aberrations in the young eye and how these aberrations are modified by aging.

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