SM Greenberg, CE Plummer… - Veterinary …, 2011 - Wiley Online Library ... Thelazia lacrymalis is a nematode that resides in the nasolacrimal ducts and conjunctival fornices of the horse. Animals are generally asymptomatic, however superficial keratitis, dacryocystitis, conjunctivitis and blepharedema can occur. ... Related articles - All 2 versions