Looking up is one of the core riding skills.
Improve your skill and you’ll ride faster and safer.

On the trail, where are you looking?
Are you too focused on watching the trail right in front of your wheel?

Your focus should be further down the trail rather than right in front of your wheel.
You should be using a combination of focal vision (down the trail) and
peripheral vision to take in what is happening immediately around you. 

Join a skills clinic, and develop your looking skills.