This is the ophthalmoscope used by H. N. Allen, who served as the head of the Jejungwon Infirmary (House of Universal Helpfulness), the first Western medical institution in Korea. The device, which was made by Gall & Lembke Opticians, was widely used in the United States in the 1870s. Allen’s bereaved family donated it to Yonsei University around 1984-85. It is a valuable item left by a person who played a significant role in Korea’s medical services and diplomacy in the early modern period.