Consider your possible “cures” in the same way humans “cure” their blindness. If your dragon has cataracts, surgery could be an option if you could find a vet willing, able, and trained to do it. But if this is a natural degredation from age, there is no “cure.”
Neverwinter Nights and Roller Coaster Tycoon when I was a little kid. I watched my dad play Neverwinter and had to indulge in my own tiny fantasy to play as a “dragon.” Still at it.