If you can't change a job where you constantly sit in front of a screen, you should take breaks and rest your eyes. Just think about how much stress this puts on the body, you not only damage your eyesight, but also injure the body as a whole, you will probably experience neck and back pain, and what will happen to your sleep. Take care of your health, one day you will realize that it would be cheaper to change jobs than to spend money on restoring your physical health.