Demodex folliculorum and oedema of the eyelash.

In I842 the Frenchman Berger discovered the mite Demodex folliculorum and later intro- duced this parasite to medical science (Berger, I845). After more than a century of sporadic literature on this topic, there has been a resurgence of interest in ophthalmology triggered off by a stimulating thesis on Demodex folliculorum blepharitis (Coston, i967).