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Instruments from the 2nd century A.D. of the Gallo-Roman oculist Gaius Firmius Severus found in a tomb in Rheims, in 1854. The seal bears the oculist's name and his collyrium or eye-salve- diasmyrnes, prepared from myrrh.. Credit: Wellcome Collection. Attribution 4.0 International (CC BY 4.0)