Eye cancer doesn't always cause obvious symptoms and may only be picked up during a routine eye test. Symptoms of eye cancer can include: shadows, flashes of light, or wiggly lines in your vision blurred vision a dark patch in your eye that's getting bigger partial or total loss of vision bulging of one eye a lump on your eyelid or in your eye that's increasing in size pain in or around your eye, although this is rare These symptoms can also be caused by more minor eye conditions, so they're not necessarily a sign of cancer. However, it's important to get the symptoms checked by a doctor as soon as possible.