Calomel.
Castor Oil: a drop in eye to lessen irritation from foreign body.
Cocaine Hydrochlorate.
Copper Acetate.
Copper Aluminate.
Copper Sulphate: as collyrium.
Creolin Solution, 1 per cent.
Ergot: the fluid extract, undiluted, locally in engorgement of the conjunctival vessels.
Eserine.
Euphrasia: as a mild astringent.