Front and Side:
Headset button is used to control several basic headset functions:
Lens distance button is used to change the distance between the eyes and the lens. If you wear large prescription glasses or have long eyelashes, you may need to increase the lens distance further from your face. To do this, press and hold the lens distance button on the headset, and then pull or push the visor to adjust the lens farther or closer to your face
Back:
Bottom and Inner:
Interpupillary distance (IPD) knob is used to change the distance between the lenses, it correlates to the distance between the center of the pupils in your eyes. When turning the knob, the distance is shown on the Headset screen. Adjust the distance between the lenses of the headset so that you'll have a better viewing experience.