I enjoyed this. Now I'll have to look for the tree-alphabet outside of my window. But you're right, after putting my glasses on it simply can't be the same as just letting my eyes relax and trace the letters. My vision is about the same as yours, and it's sad to miss out on little things like the tree-alphabet. But just think: without our glasses, it's a whole new world that no one else can see, full of color-smears and dark and light and no sharp corners at all.
Read Annie Dillard's essay, Seeing. I believe that's the title, at any rate. It's one of the most beautiful things I've ever read, in terms of both content and poetic writing style, and it made me appreciate my blurry, unclear view in a way that I hadn't. She can't see that, no matter how hard she tries, and all I have to do is drop a pair of spectacles on my nose in order to see with perfect clarity.