LNSLNS We thank our correspondents for their comments on our article on cataract surgery with implantation of an artificial lens (1).

We agree that because of the spectral transmission attributes of the natural lens, the use of blue-filtering lenses should be the gold standard in the implantation of intraocular lenses, since this variant most closely resembles natural transmission.

However, our findings did not confirm the often quoted benefits for contrast sensitivity (and visual acuity). On the contrary, the perception of colors usually even deteriorates slightly (2).

However, the final proof of AMD prophylaxis, which is also an often mentioned topic in the discussion surrounding blue-filtering intraocular lenses, is currently lacking. An artificial lens with a UV protective filter might also be regarded as offering sufficient protection (3). Further long term studies evaluating the protective effects achieved with blue-filtering lenses are needed in order to be able to draw a scientifically based conclusion (3).

Since the use of yellow blue-filtering intraocular lenses in general does, however, not seem to be associated with great harm and may even be associated with benefits, we agree with Professor Hünig and Dr Hünig’s comments overall.
DOI: 10.3238/arztebl.2010.0151b


Prof. Dr. med. Thomas Kohnen
Institut/Lehrstuhl: Klinik für Augenheilkunde
Theodor-Stern-Kai 7
60590 Frankfurt am Main, Germany
kohnen@em.uni-frankfurt.de

Conflict of interest statement
The University of Frankfurt has received study support for the evaluation of intraocular lenses from Alcon Pharma GmbH, AMO-Germany GmbH, Bausch & Lomb Surgical, Pharmacia Ophthalmics, and Rayner Surgical GmbH.
1.
Kohnen T, Baumeister M, Kook D, et al.: Cataract surgery with implantation of an artificial lens [Kataraktchirurgie mit Implantation einer Kunstlinse]. Dtsch Arztebl Int 2009; 106(43): 695–702. VOLLTEXT
2.
Mester U, Holz F, Kohnen T, et al.: Intraindividual comparison of a blue-light filter on visual function: AF-1 (UY) versus AF-1 (UV) intraocular lens. J Cataract Refract Surg 2008; 34: 608–15. MEDLINE
3.
Cuthbertson FM, Peirson SN, Wulff K, et al.: Blue light-filtering intraocular lenses: review of potential benefits and side effects. J Cataract Refract Surg 2009; 35: 1281–97. MEDLINE
1. Kohnen T, Baumeister M, Kook D, et al.: Cataract surgery with implantation of an artificial lens [Kataraktchirurgie mit Implantation einer Kunstlinse]. Dtsch Arztebl Int 2009; 106(43): 695–702. VOLLTEXT
2. Mester U, Holz F, Kohnen T, et al.: Intraindividual comparison of a blue-light filter on visual function: AF-1 (UY) versus AF-1 (UV) intraocular lens. J Cataract Refract Surg 2008; 34: 608–15. MEDLINE
3. Cuthbertson FM, Peirson SN, Wulff K, et al.: Blue light-filtering intraocular lenses: review of potential benefits and side effects. J Cataract Refract Surg 2009; 35: 1281–97. MEDLINE