Cancer of the eye is uncommon. It can affect the outer parts of the eye, such as the eyelid, which are made up of muscles, skin and nerves. If the cancer starts inside the eyeball it's called intraocular cancer. The most common intraocular cancers in adults are melanoma and lymphoma. The most common eye cancer in children is retinoblastoma, which starts in the cells of the retina. Cancer can also spread to the eye from other parts of the body.

Treatment for eye cancer varies by the type and by how advanced it is. It may include surgery, radiation therapy, freezing or heat therapy, or laser therapy.

Intraocular melanoma is a cancer of the pigment-producing cells (melanocytes) in the middle layer of the eye, called the uveal tract. The uveal tract has 3 main parts: (1) the choroid (the tissue layer filled with blood vessels); (2) the ciliary body (the ring of muscle tissue that changes the size of the pupil and the shape of the lens); and (3) the iris (the colored part of the eye). Most cases (90%) of intraocular melanoma develop in the choroid, called choroidal melanoma; the ciliary body is less commonly a site of origin, and the iris is the least common. Each manifests with different clinical features and symptoms. Treatment depends on the site of origin (choroid, ciliary body, or iris), size and location of the tumor, the age of the individual, and other factors.