Parasites in the eye, which may occur in various parts of the body, have severe symptoms and lead to irreversible vision loss. In more serious types of diseases, such as intravitreal porcine cysticercosis, most patients have insignificant symptoms with a mild inflammatory reaction when the larvae are alive and cannot be taken seriously, and can see black shadows in front of their eyes. If the larvae die, they can rapidly cause a strong inflammatory reaction, with obvious subjective symptoms and rapid loss of vision, which is further aggravated by the combination of endophthalmitis. When an examination is performed, a larval shadow in front of the retina can be seen, and in severe cases, retinal edema and vitreous clouding occur, requiring prompt medical attention. If necessary, direct vitrectomy is required to remove the worms and repair the retina, and it is more difficult to restore normal vision in most patients.