As koiyu mentioned in the comment, eye tracking is what you should be after. You can create designs with the intent of leading users along a path, but the only way to really know if you're accomplishing your goals is to do an eye tracking study.
That said, you might find my answer useful for the question, How to draw attention to a specific area of a design? It's not the exact same question, but it's close.
More eye tracking resources:
- Eye Tracking: Best Way To Test Rich App Usability
- Web form design guidelines: an eyetracking study
- Eye tracking study reveals 12 website tactics
- A StackOverflow question about setting up your own eye tracker with a web camA StackOverflow question about setting up your own eye tracker with a web cam
Eye tracking services: