Panum's area measurement method, apparatus, and wearable display device

A wearable display device, comprising a first display unit, a second display unit and an interaction end, wherein

• the wearable display device further comprises an adjusting module and a measuring module that receive a signal from the interaction end;
• wherein
• the first display unit is configured to project a first parallax image of a spatial object to the left eye of a user under test, and the second display unit is configured to project a second parallax image of the spatial object to the right eye of the user under test, the first parallax image comprising a first homologous point and the second parallax image comprising a second homologous point;
• the adjusting module is configured to adjust, under control of the interaction end, a horizontal parallax amount between the first homologous point and the second homologous point until the user under test observes the spatial object producing a ghost;
• and
• the measuring module is configured to acquiring a parallax amount parameter Δne, calculate a horizontal physical spacing Δx between the first homologous point and the second homologous point based on the parallax amount parameter Δne, and calculate a panum's area range (μin, μout) of the user under test based on the horizontal physical spacing Δx.