sentences:  Prior to this publication, descriptions regarding methods of ophthalmological surgery practiced in these countries were not yet available in the French language.This book was a result of Deval's studies in Vienna with Friedrich Jäger von Jaxtthal (1784–1871) and Anton von Rosas (1791–1855).Included in his treatise were explanations of medical innovations developed by German surgeons Louis Stromeyer (1804–1876) and Johann Friedrich Dieffenbach (1792–1847).