Curing blindness :
I assume eating a lot of cress like these will suffice, although the brain would have to adapt the upside down image in the beginning. That’s actually ridiculous after all those years. Saw it in the Star Wars movie Rogue.
Seeing colors:
We could perhaps eat salty cornflakes material from the oven, while salting it before the oven. The air-fryer maybe doesn’t suffice, due to different entropy.
I assume we would then get the fibers to connect the cone cells on our retina.
Restoring hearing:
My gut feeling tells me that we simmer (we don’t bake them) simmernaps that look like this, and eat them to restore our hearing. Indeed mom’s recipe (sudder lapjes). Not that I was hiding it.
I assume we would then get the fibers to connect the cilia (vibrating hairs) in our inner ear.
If I walk with my head down and I’m about to bump into a pole then I get some reflex, like I can feel the pole with my longitudenal brain waves. Different from how sharks & birds sense magnetism.