Ive been told my eyes show eventual macular degeneration.
I will not be able to use this computer.
I don't know when it will happen.
I will be blind before I die.
That's bad news, I'm sorry. However there's no reason you wont be able to use a computer. I have been blind since birth and use a computer and a smart phone every day. NVDA is an excelent open source screen reader for Windows. There are screen readers for other operating systems too. If you like emacs, emacspeak makes it talk. on Linux there is Orca, Speakup etc.
I might have 10years, 20, 30... we don't know.