History of Medicine By laurentenney Jan 1, 1010 Avicenna writesThe Book of Healing and The Canon of Medicine Jan 1, 1249 Roger Bacon invents spectacles Jan 3, 1489 Leonardo da Vinci dissects corpses Jan 3, 1543 Vesalius publishes findings on human anatomy in De Fabrica Corporis Humani Jan 1, 1587 Louis Pasteur identifies germs as cause of disease Jan 1, 1628 William Harvey publishes An Anatomical Study of the Motion of the Heart and of the Blood in Animals Jan 1, 1683 Anton van Leeuwenhoek observes bacteria. Jan 1, 1879 First vaccine developed for cholera Jan 1, 1980 Smallpox is eradicated Jan 3, 2012 Zacharius Jannssen invents the microscope Mar 2, 2022 Persian physician Rhazes identifies smallpox