Why do light at both ends of the electromagnetic spectrum go through stuff easier than light in the middle?

Question

its possible that our eyes adapted to see the middle because it can actually be seen, but why is light more go through-able at both ends?

Answer 1

Great question, the solution needs some very simplified quantum mechanics.

It happens that molecules and therefore materials (made of molecules) can be in different states. These states are at different energies.

Light particles are most absorbed, if the material the light shines on, has states that are separated by an energy close to the light particles own energy.

As in turns out light from the middle energy range you describe is very suited to the gap in energy levels in most materials. So it is strongly absorbed. Higher or lower energy light simply has the wrong energy.

In all likelihood eyes have indeed tuned their range through evolution. This region is a good choice as it is easy to absorb whilst being penetrating enough to be useful (eg it goes through the atmosphere) and due to the sun is very well supplied.