Toxocariasis is a rare infection caused by roundworms, Toxocara canis and Toxocara cati. It was first recognized to be associated with dogs in the 1940s. It typically affects children and can lead to profound monocular loss of vision despite known medical and surgical therapies.In humans, after contact with infected fecal material, the roundworm migrates throughout various organs but is unable to sexually mature. Reactive inflammatory processes lead to the organism's encapsulation. Ocular larva migrans is a result of the ingested egg developing and migrating to the eye causing local disease.
If your eye is affected by toxocariasis, anthelmintics aren't used, but steroid medication (corticosteroids) may be required to suppress inflammation. Surgery may also be needed – for example, if you develop retinal detachment.In the United Kingdom, about 2,215 cases of Toxocara infection are reported in humans each year. Almost 16% of the UK population is infected with Toxocara.