It sounds like macular degeneration. There is a lot of information on the subject on the internet, complete with illustrations, etc.
It would surprise me if I had it. I eat a lot of leafy veggies, loads of omega-3 fatty acids(salmon, tuna), do a lot of exercise, am male, don't smoke, am lean and way under 60. I'm not the typical risk group.
At least I hope I don't have. That seems like a serious disease.
See an ophthalmologist ASAP. The risks you mention add to your genetic risks.
You should see a doctor at once. Whatever it is, it could spread to your whole eye and possibly brain.