|Daylight on your monitor|
If you are right-handed it's good to have natural daylight coming over your left shoulder when you're writing. If, however, you're trying to see something on a computer monitor in bright daylight, you can be straining your eyes to read it. This problem will depend on the time of day, the time of year, and the position of your desk.
Solutions range from lowering a window shade to moving your desk in extreme cases. The chances are that you've already picked the best place for your desk and you don't want to move it somewhere else.