In animal and human hosts, infestation by Thelazia may be asymptomatic, though it frequently causes watery eyes (epiphora), conjunctivitis, corneal opacity, or corneal ulcers (ulcerative keratitis). Infested humans have also reported "foreign body sensation"the feeling that something is in the eye.
Thelaziasis
Necatoriasis
Paragonimiasis
Isosporiasis
Metagonimiasis
Helminthiasis
Scarabiasis
Naegleriasis