KEEP YOUR SCREEN AT ARM’S LENGTH
Once your chair and desk are adjusted, turn your attention to your screen. Position your screen at arm's length (fist closed), and make sure the top of your screen is aligned with your eye level to avoid tension in your neck.
If you’re working on a laptop, try using a laptop-stand or some books to elevate the top of the screen to eye level.
If you’re using two screens, ensure your main screen is placed directly in front of you while the second stays right next to it to avoid excessive neck movements.