Thelazia californiensis

The·la·zi·a cal·i·for·ni·en·'sis

a nematode species occurring in the tear ducts, conjunctival sac, or under the nictitating membrane of dogs, coyotes, black bears, sheep, deer, jack rabbits, cats, and, occasionally, humans in the western and southwestern U.S.; heavy infections cause photophobia, lacrimation, eyelid edema, conjunctivitis, and even blindness.
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* Parasitic conjunctivitis is rare in North America, but in some cases bot fly larvae or, in the Western United States, the parasitic worm or nematode Thelazia californiensis can inhabit the conjunctival sac between eye and eyelid.