Firstly, thanks for appreciating the needs of the visually impaired
I don't have any success stories as such, just developments in my ability that I have found rewarding.
I recently rewatched a TV series and found myself at least being able to pick out one or two words from each sentence, and in some cases understanding entire lines or sections of dialogue. When I first watched it, I'd be lucky to pick out 10-20 words per episode, so it's really encouraging. Similarly with reading, it takes me far less time to break things down, and whenever I see anything in full kanji that I can easily read, it makes all the effort seem worth it.
It's relative to the individual, so I suppose the rewards you get depend on your reasons for studying. For me, learning a second language was an ambition for a long time, so studying is something of a hobby for me, and as long as I steadily progress and learn new things, I'm happy with the way things are.