"Johann Andreas Eisenbarth (March 27, 1663 – November 11, 1727) was a German surgeon who was a native of Oberviechtach, Bavaria.
Eisenbarth was an oculist and barber-surgeon ...
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who specialized in treatment of cataracts, calculus surgery, and the treatment of bone fractures. His grandfather and father were also surgeons, and much of Eisenbarth´s medical knowledge was learned from his brother-in-law. Although he was referred to as "Dr. Eisenbarth", he had no formal medical credentials, nor was he officially awarded the title "Doctor". Despite this, he was considered a skilled surgeon, and was bestowed with privileges by members of German royalty." - (en.wikipedia.org 30.09.2020)