In 1974, she became chair of ophthalmology at Hospital Robert Debrè [fr] and Hospital Foundation Adolphe de Rothschild [fr] (Rothschild Eye Foundation) in Paris.[1][5] She began her career studying tumors on the back of the eye.[4] Working at the Rothschild Eye Foundation in Paris in the early 1970s, she began experiments in which she attempted to cut vitreous strands with a laser.[6] Ruby lasers had recently come in to use for eye surgery, but their extreme power and limited speed often damaged the eye.[7] Sparked by her interest in physics, she began researching how the rate could be accelerated and the power lessened.[4][8]