Answer:
A tower at the root of all confusion.
You'll have to consult an optometrist if you want to improve this.
The more you have of me, the less you see. Who am I?
In many hallways you would stand, if not with this in hand.
Low on cash? Pick out items from this rack.
I touch the Earth, I touch the sky, but if I touch you, you’ll likely die. What am I?