Have you had your vision checked recently? You might need glasses. Another issue is that you need frequent breaks from looking at a screen. At least every 5

Have you had your vision checked recently? You might need glasses. Another issue is that you need frequent breaks from looking at a screen. At least every 5-15 minutes, you should take a break and look at something further away and let your eyes focus on it. I also have an Ergotron adjustable stand for my central monitor. That way, I can move the monitor backwards and forwards every so often to let my eyes adjust to different focal lengths throughout the day. And, I can change position in my chair.