Either of two parasitic nematode worms which affect the eyes of mammals.
a filarial worm of equatorial Africa, infesting humans and other primates, causing loiasis and sometimes passing across the cornea (Loa loa, class Phasmida)a nematode that occurs in the region of the eyelid and tear duct, found chiefly in hoofed mammals (genus Thelazia, class Phasmida)‘The nematode eye worm, Thelazia sp. is transmitted to horses and cattle by the face fly.’
- ‘An eye worm of the genus Thelazia was first reported in the United States in 1930.’
- ‘The eye worm lays eggs on the surface of the eye.’