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Real IPD is the actual distance between the center of your eyes' pupils in real life. Any [[Head-mounted Display]] require this measurement to accurately position the virtual camera outputs on the screen in front of the user's eyes. The outputs have to be directly in front of both of the users' eyes. Any deviation can cause [[eye strain]]. Most [[HMD]]s allow users to adjust their camera output positions to match their IPD.
Additionally, some HMDs allow the physical position of the lenses and screens to be adjusted to match the user's physical IPD.
The average IPD for humans is 64 millimeter, with a range of 54 to 72 millimeter. You can measure your IPD by measuring the distance between the center of your pupils with a ruler.
