Now, if you move the screen closer to you, or if you'd swap the screen for a bigger one, you would have to increase the FOV. You would have to set a certain FOV for that. If you had a 3D computer model of your current actual reality, you could look at this model on a screen, so that it is perfectly aligned with the actual reality that you can see around the screen.
While the right FOV is usually a matter of taste, there is in fact an objective rule: The 3D graphics should look natural to the vision center in your brain and your eyes. However, many games released on the PC (such as console ports) do not have the correct FOV adjustment, usually because the FOV has been kept the same as it was on the console version of the game.
PC games should be designed with a high FOV of around 85-110 because players normally sit closer to their display.An appropriate FOV is different depending on how far the player is away from a display.
