A person had trouble with his vision; he saw everything slanted. He lived in a small town and thought the houses were collapsing because he saw them on a slant. But they were tiny houses; even if they fell, it wouldn't be a great tragedy.
Then he moved to a large city with skyscrapers. He shouted to people, "Be careful. Run away! The buildings are falling." People panicked and ran for their lives. One wise person said, "There is no reason to run. All we need is an eye doctor. Is there an eye doctor here?" People didn't understand how an eye doctor would stop the buildings from falling. An eye doctor came forward, checked the person's eyes, and discovered that his eyes were the source of the problem. The problem wasn't with the buildings, but rather with his eyesight.
The nimshal is that people have crooked eyes. They panic when they don't see how they will support themselves because they don't see things correctly. When you see the world correctly and know that parnassah is from Hashem, you will never worry.