Trichiasis

Thatcondition where the eyelashes, instead of ex-tending forward, are directed more or less backward, so as to come in contact with the cornea.Trichiasis causes a continual irritation of theeyeball, due to the action of the cilia (eyelashes) ; there is photophobia, lachrymation,and a constant sense of a foreign body in theeye. The cornea itself suffers considerableinjury.

Source: Ophthalmic Dictionary including pronunciation, derivation and definition of the words used in Optometry and Ophthalmology by James J. Lewis, Oph. D. Professor of Optometry in the Northern Illinois College of Ophthalmology and Otology, Chicago.