I'm going to try this technique.

Stare at a distant object for a few minutes.

Many of us spend most of our waking hours staring at a digital screen, which can strain our eyes and actually make it more difficult to focus on, and therefore process, what we're looking at.

To refocus the eyes, just stare at a distant object for a few minutes. One doctor suggested the "20-20-20 rule" to a journalist at LifeHacker. It goes like this: Every 20 minutes, take 20 seconds to stare at an object at least 20 feet away.