Hans Lauber (1876–1952): Cosmopolitan ophthalmologist and his post‐ <scp>WWII</scp> extradition request

Hans Lauber (1876-1952) was a Swiss-born Austrian ophthalmologist whose career spanned Vienna, Warsaw and Kraków. Once a celebrated scholar and surgeon, Lauber is now a largely forgotten figure in the history of European ophthalmology. This study reconstructs his complex biography, emphasizing his appointment at the University of Warsaw, the role of the John Warden Foundation and the controversies surrounding his wartime activities. Lauber was the author of at least 79 publications, including five textbooks, and was one of the pioneers in the study of visual field physiology and pathology, as well as a co-developer of perimetry standards. He designed his own diagnostic instruments, including a perimeter, a light-spot projector and a red-free fundus examination lamp. From 1931 to 1940, he led the Department of Ophthalmology of the University of Warsaw, in Poland, and between 1939 and 1940, he served as Dean of the Faculty of Medicine at this university. With financial backing from the US-based John Warden Foundation, he modernized the Warsaw Department of Ophthalmology. During the German occupation of Poland, Lauber directed the Jagiellonian University Ophthalmology Department in Kraków, leading to post-war allegations of collaboration and unethical behaviour. Arrested in Austria in 1946, he was never extradited to Poland; the charges were dropped for lack of conclusive evidence. Lauber's life reflects the tension between scientific achievement and moral ambiguity in an era of political turmoil. His story illuminates the fragile boundary between medicine, ethics and history in 20th-century Europe.