Illustration from Ming Chinese ophthalmology text, Ms copy
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Illustration of Full floating jade nebula (yu yi fu man), an 'external eye disease' (waizhang), from Michuan yanke 72 zheng quanshu (Secretly Transmitted Compendium of 72 Ophthalmic Diseases) by Yuan Xueyuan (Ming period, 1368-1644). This book uses a combination of text and pictures to explain the symptoms, causes and treatment of 72 different eye conditions, 48 of which are described as external.
Picture heading: Full floating jade nebula (yu yi fu man), external eye disease (waizhang)