This restricted space is defined as the Eye Motion Box (EMB). As long as you are within the EMB you will have your IFOV. If you move around inside the EMB, your angles will allow you to see more of the landscape up to a certain limit.
LiteWave offers the largest eye-motion box of any HUD available, which means pilots are able to move more freely in their seat, without risk of losing sight of the display. This freedom of movement allows you to maintain comfort and not be stuck in one po
Eye Relief shall be defined as a range, and not a single value, when this range is a part of the System Eye Box or Eye Motion Box or System Pupil Space (more on this will be detailed in a separate post dedicated to System Pupil).