Improve you vision at a monitor
Configure your monitor for fatigue-free, better vision at work or in your spare time.
Do you see 9 different, clearly delimited and different grey areas? The left field should be totally black, and the right one totally white.
If that is not the case, change the brightness and contrast until you get the desired result.
Put the monitor at a distance of ca. 50 cm away from your eyes. Also make sure you have an easy to read font size for text.