Antique vintage Cobalt blue glass eye wash cup by Wyeth & Co., featuring the embossed "WYETH" lettering and a threaded base designed to double as a bottle cap. Used in the 19th and early 20th centuries for bathing or rinsing the eye with liquid medicine or eyewash solution. Molded from deep cobalt blue apothecary glass with an contoured rim shaped to fit the orbital socket around the eye.