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Eye Parasite Removal

A man in his 40s from Thailand presented with a 4-week history of blurred vision in his right eye diagnosed as diffuse subacute unilateral neuroretinitis (DUSN). After treatment for presumed toxoplasmosis his vitreous cleared and a threadlike parasite that migrated to the posterior pole was more easily seen. This video illustrates removal of the parasite via pars plana vitrectomy with a soft-tip extrusion tube (Video). The parasite was identified as a live adult female Thelazia. Thelazia nematodes (also called eye worms) commonly cause ocular infections in animals but rarely in humans. Most reports of ocular human thelaziasis include cases of extraocular infection such as conjunctivitis, epiphora, keratitis, and/or corneal ulcers. In this case the infestation was presumably acquired through consumption of raw meat. Click http://ja.ma/1H3dAGA for a full case discussion.