Answer:
What is the word that even in plain sight remains hidden?
You'll have to consult an optometrist if you want to improve this.
What is used by man, tossed by trees, everywhere but unseen?
What has fingers and a thumb but no hand?
It's shorter than the rest, but when you're happy, you raise it up like it's the best. What is it?
What is always coming but never arrives?