Then along with the natural lens, it acts like a camera-lens and focuses the image onto the retina. It lines the inside of the eye, and is mostly clear. The retina has very few blood vessels which would disturb the retinal picture. Since the retina has so few blood vessels and does a lot of work, it needs to be nourished by a blood vessel layer beneath it, called the choroid or uvea. Not only does the choroid feed the retina, but it also contains pigment cells called melanocytes.
Melanocytes are the cells which can lose control, and grow into a malignant melanoma.
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