Editor,—I congratulate Scott and Karp for their excellent paper on Euphorbia sap keratopathy,1 but would like to emphasise that the sap of certain plants of this genus can cause blindness.

Clinicians should be aware of the sight threatening uveitis caused by some euphorbias. Duke-Elder has reviewed the older literature, citing reports of severe keratouveitis caused by the sap of the European perennial herb Euphorbia esula (previouslyTithymalus esula) and a Cuban species recorded as E antiquorum.2 Uveitis with hypopyon has been described …