Adjusting the IPD on the headset
Interpupillary distance (IPD) is the distance between the centers of your pupils. A quick way to get an estimate is by facing a mirror and holding a millimeter ruler against your brow. Use this measurement as a guide to adjust the distance between the lenses of the headset so that you'll have a better viewing experience.
To increase the distance between the lenses, rotate the IPD knob clockwise. To decrease, rotate the IPD knob counterclockwise.
As you adjust the IPD, you'll see a prompt indicating the current distance between the centers of the lenses.