You’re squinting and rubbing, but your tired eyes continue to torture you. And it’s no wonder they’re sore: how many hours a day do we all stare at a screen? This puts almost constant tension on our eyes. Many vision problems arise precisely from the act of overstraining like dry eyes, redness, and blurred vision. To keep toning up those eye muscles, extend your arms to their fullest and stick both thumbs up, holding them directly in front of you at both sides. Focus your vision on the tip of your right thumb for 5 seconds. If you have to work in front of a computer for long periods of time, take a break every 20 minutes and look at something 20 feet away for 20 seconds.