Here's one case where I'd say the crank research filter is too sensitive-- natural vision improvement. I've had some experience of it working, but the usual response to the idea that anything other than surgery or lenses can improve eyesight in well-nourished people has been "it's all about the shape of the lenses of your eyes", and anything else is nonsense.

Since I knew you'd ask, my night vision has improved considerably. I've been too stubborn to wear glasses (details later if people are interested). When I moved to Philadelphia in 1995, I couldn't read the street signs at night. And when I say couldn't , I mean that I couldn't read them if I stood as close to the sign as possible and squinted. Now I can read them at a moderate distance (will check on just what, but a definite improvement).

I haven't been testing my vision-- it's mostly been more acuity checked by at what distance I can read street signs.

And it isn't just a shift of the clear visual range with time. (I'm 56.) I can still see the little Lincoln in Lincoln memorial on the back of a penny.

Now, it turns out that neuroplasticity applies to the visual system.