The choroid layer is next to the retina, the part of the eye that makes a image.
Intraocular melanoma is the most familiar eye cancer in adults. Intraocular melanoma is a form of cancerous tumor in the eye. The fraction of the eye affected by this rare type of cancer is the uvea. The uvea contains cells called melanocytes. When these cells become cancerous, the cancer is called a melanoma. The uvea comprises the iris (the colored part of the eye), the ciliary body (a muscle in the eye), and the choroids (a layer of tissue in the back of the eye). The iris opens and closes to alter the amount of light entering the eye. The ciliary body changes the shape of the lens inside the eye so it can focus.
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