Basic Plane 1
Basic Plane 1 : The anatomical plane on a headform that includes the superior rim of the external auditory meatus, the upper edge of the external openings of the ear, and the inferior margin of the orbit, which is the lowest point of the floor of the eye socket. This corresponds to a distance of 130 mm from the top of the ISO J Headform and 134 mm for the Alderson 50th-percentile headform
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