Diffuse unilateral subacute neuroretinitis (DUSN) is a clinical syndrome first described by Gass and associates in 1978, characterised early by visual loss, vitritis, papillitis, and recurrent crops of grey-white retinal lesions and later by progressive visual loss, optic atrophy, retinal vessel narrowing, and diffuse retinal pigment epithelial degeneration.1,2 Baylisascaris procyonis , the common intestinal raccoon roundworm, is believed to cause DUSN and its potential to affect ocular tissue has also been described in animal models.3–5 We describe a case of infection by Baylisascaris procyonis where the larva was found entrapped in the vitreous. A 37 year old white man presented for a second opinion. He had experienced flashes and floaters in the left eye for 10 days. …