I have a niece with low-vision who plays the baritone clarinet. If you want to see an approximation of what being legally blind is like, take a look at http://www.acbvi.org/albums/Vision/slide11.html.
The solutions for her reading music are few and very expensive. A large screen music reader goes for $4k! Doing a little research, I game across a system put together by Tom Green. It combined foot pedals with the $600 Finale music notation software.
I figured a little Python programming and an old laptop could go a long ways very cheaply. Here is what I came up with looks like:
What does "allegro animato" mean? "Comfortably fast", which is how I would describe the development of the this program. Or maybe "quick" and "easy". Amazingly, it is only about 600 lines of Python code.
It is not perfect, but I'm pleased with how it turned out. I love my hobbies, and if I can use them to help someone else enjoy their hobbies, all the better! I'll share it with anyone that want to use it. So that would be $0.00 if you already have a laptop, $30 if you add pedals. Send me an email.