I have Retinitis Pigmintosa, so my eyesight is slowly degenerating. I didn’t start out with perfect vision like you, but damn I wish I had the same vision I did growing up. Anyway, how I deal with it? I think it really depends on you. You’ll adapt, but you may or may not deal with it well. I have my ups and downs. I get frustrated. I was able to see a white board with green marker growing up from couple of metres away and now even with my nose touching the white board, i can only just comfortably see black marker but contrast and glare can ruin that. So, really it depends on the time. You may cope fine, and shrug it off, or you’ll find something a little harder to see and take you by surprise. People I know who has had slight development of eyesight issues, they were shocked when they caught onto it, but I don’t think they’ve dwelled on it.

I have RP as well as the dude above and I second everything he said. You'll have to adapt continuously. It'll be very frustrating sometimes as when you finally get used to a specific adaptation it is no longer usable and you have to start the process of finding another one all over again, time after time. It can be a very rich experience too, you'll learn a lot about yourself, the world and other people. The key is never giving up.

What do you have in your eyes that cause your vision loss?