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| The 150th Birth Anniversary of the pioneering
German ophthalmologist
(1828-1870) Friedrich Wilhelm Ernst Albrecht von Graefe was commemorated in this FDC issued by West Berlin in 1978. Amongst his many discoveries are Graefe's sign (failure of the upper lid to follow a downward movement of the eyeball when the patient changes his or her vision from looking up to looking down) and Graefe's knife (knife designed for cataract extraction). a
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