The purpose of this note is to bring to light a remedy for an eye ailment pre-served in a fifteenth-century Irish medical compendium that consists mainly of remedies to treat ailments affecting the human body. The main scribe of the text in question is Connla Mac an Leagha, who was working as a prac-tising physician, probably under the patronage of the Mac Diarmada lords in the medieval lordship of Magh Luirg (Moylurg) in Roscommon. The remedies are, for the most part, arranged in the a capite ad calcem order, as is usual in this kind of compendium, and they include cures for ailments for every part of the body from the head to the feet. The single copy of the com-pendium is now divided between two manuscripts. The larger part survives in the composite manuscript RIA MS 445 (24 B 3) (pp 33–93). The text of two lacunae in that manuscript (after pp 70 and 74), is found in sixteen pages preserved in RIA MS 467 (23 N 29) (ff 1–4, 6–9).