An old friend of mine in his late 70s who ran several software businesses is starting to experience vision deterioration. Of what type, I don't know, but it's interfering with his ability to do any kind of computer work. It really drove home for me that in the long run we're all disabled.
I have a bit set to try to learn how to use Emacspeak so I at least have a plan B for if/when my vision goes to the dumper -- or I lose it completely.
I started using Emacspeak in the late 1990's, and probably peaked ~2003-2006.
I have associates with visual impairments ranging from nothing (i.e.,completely gone (i.e. "blind")) to severe mis-alignment of vertical focus, ...and the standard of colour-blindness. I try to help them to the best of my abilities.
My own acuity (currently) allows the use of monospace typefaces/fonts and grey-scales. There are times when my vision cuts out pretty bad. I assume it will get worse and sometime in the future I think I will rely on Emacspeak. Also, pointer/mouse use is almost a complete wash for me.
Hence the "plan B" You mentioned.
Edit: I do not want to lose access to computers (screw networked ones (love those)), I really love (almost) any programming environment
I have a bit set to try to learn how to use Emacspeak so I at least have a plan B for if/when my vision goes to the dumper -- or I lose it completely.