This section is from the book "Materia Medica And Therapeutics Inorganic Substances", by Charles D. F. Phillips. Also available from Amazon: Materia medica and therapeutics.
In these chronic, recurrent disorders of the eye-lashes and lids, the crusts and muco-purulent discharge, and in severe cases the lashes, should be carefully removed, and a crystal of copper sulphate lightly applied to the affected parts. This treatment has the recommendation of Sir W. Wilde (Dublin Quarterly Journal, No. 10), of Galezowski, and other authorities, and Mr. Williams (Boston) has published good practical instructions concerning it (Ranking, ii., 1870). I myself commonly prefer this remedy to either zinc or silver, since it is milder, and causes less pain; I generally combine with it the use of a dilute mercurial ointment.