The symptoms of eye tumors depend on the location, growth rate, and degree of malignancy. For example, the common malignant tumor of the eyelid, basal cell carcinoma or squamous cell carcinoma, is a melanoma-like tumor that grows on the lid margin and is accompanied by a long-lasting ulcer in the area of the elevation. In lid adenocarcinoma, the lid gland has a wheals-like appearance, but the wheals do not heal over time and recur after surgery. Intraocular tumors in adults are commonly cavernous hemangiomas, which are asymptomatic in the early stages and later associated with protrusion of the eyeball or pressure on the optic nerve, resulting in impaired vision. Intraocular tumors in adults include choroidal melanoma, which manifests as a black shadow in front of the eyes in the early stage and gradually increases in size, and later is accompanied by increased intraocular pressure and perforation of the eye, while retinoblastoma in pediatric patients develops a cat-like pupil in front of the eyes after birth.