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A special issue of the Documenta Ophthalmologica is dedicated to a symposium on uveal melanomas that was conducted in Utrecht, the Netherlands, in 1979 on the occasion of the presentation of the Snellen Medal to Dr Willem A. Manschot of Rotterdam, the Netherlands. Most of these contributions also have been published in other publications, but it is nice to have them in an anthology. The controversy between Lorenz E. Zimmerman, MD, and Ian W. McLean, MD, on one side, and Manschot and Hennie van Peperzeel, MD, on the other, makes fascinating reading. The Zimmerman-McLean point of view is based on the Donders lecture given by Dr Zimmerman in 1978 and published in the American Journal of Ophthalmology (1978;87:741-760). The Manschot-Van Peperzeel theory on the natural history of uveal melanomas was published in the Archives (1980;98:71-77). The discussion following the two presentations was guided by Prof G. Meyer-Schwickerath of Essen, West