So all cancer comes from cells that can’t control their growth. You and I started as one cell that started dividing into a bunch of cells that make us. So think about your hair- the cells that make it have a schedule they stick to. So you only grown so much hair every day. When cells stop checking their schedule they start making lots of new cells that eventually form a tumor. That tumor is cancer and we try to find drugs that will stop those cells from making new cells.
Eye cancer can be a type of melanoma called uveal melanoma cancer. Unfortunately we don’t know how you get it. Sometimes people have freckles in their eyes that turns into cancer but this isn’t always true. Hopefully we can find the answer out soon!