Turns out neither mirrors nor microscopes are needed for these two amazing feats of science. This video describes not only how to find your blind spot, but also why it's there in the first place.
So, that's pretty neat, but then it goes on to show how you can see the network of blood vessels in your eye that your brain usually ignores. You can do it using your own hands and the computer screen. Without mirrors. Without microscopes. See the inside of your own eye.
My mind is pretty much blown.