Rizal went to Paris and Germany after completing his studies in Madrid to specialize in ophthalmology. In Berlin, he met several top German scientists and his merits as a scientist were recognized. He served as an assistant to famous European oculists to improve his knowledge of ophthalmology. Rizal immersed himself in the scientific circles of Germany, publishing works, translating texts, and socializing with prominent scholars. Though he experienced poverty in Berlin during one winter due to lack of funds, Rizal greatly valued his time studying in Europe.