Loiasis is a parasitic infection caused by the worm Loa loa, commonly known as the African eye worm. It is transmitted to humans through the bite of infected mango flies, which are prevalent in certain regions of Central and West Africa. The adult worms can live in the human body for years, often migrating under the skin and sometimes across the eye. Symptoms of loiasis may include swelling, pain, and irritation, particularly when the worm moves across the eye. While the infection can be asymptomatic, it may lead to complications if left untreated. Diagnosis typically involves blood tests to detect the presence of the larvae.