History of Medicine By shelbirawlins 500 (B.C.) Alcmaeon of Croton distinguished veins from arteries Jan 1, 1489 Leonardo da Vinci dissects corpses Jan 1, 1670 Anton van Leeuwenhoek discovers blood cells Jan 1, 1796 Edward Jenner develops the process of vaccination for smallpox, the first vaccine for any disease Jan 1, 1818 James Blundell performs the first successful transfusion of human blood Jan 1, 1857 Louis Pasteur identifies germs as cause of disease Jan 3, 1887 First contact lenses developed Jan 1, 1922 Insulin first used to treat diabetes. Mar 2, 2022 Persian physician Rhazes identifies smallpox Jan 1, 2600 (B.C.)The Egyptian Imhotep describes the diagnosis and treatment of 200diseases