Just want to add, that you shouldn't have full brightness and contrast on on your monitor in the daylight either. First thing I do with the new monitor is cut factory set brightness to half and then play with the contrast to make it comfortable. On some monitors you should want to cut brightness even more. At first it may seem not that comfortable, but after some time eye fatigue is much less.

Also, if you're using glasses, you need a little more brightness on your monitor.

And use correct light enviroment on your workplace! Side-facing light, the usual.