There are many different parasites in the eye, and the treatment is different: 1, is caused by the infection of lice in the eyelid area, is the most common eye parasitic disease, treatment requires all the eyelashes cut off, so as to prevent lice continue to lay eggs caused by reproduction, and then need to apply antibiotic eye ointment in the eyelid area, such as erythromycin ointment to kill the parasite. 2, is caused by conjunctival fly maggot disease, also This is caused by fly eggs developing in the conjunctiva to form maggots. This can cause serious damage to vision and complications such as uveitis, and requires vitrectomy to kill and remove the parasite.