The term "face-ism" or "facial prominence" was initially defined in a 1983 study in which facial prominence was measured by a "Face-ism index", which is the ratio of two linear measurements, with the distance (in millimeters or any other unit) from the top of the head to the lowest visible point of the chin being the numerator and the distance from the top of the head to the lowest visible part of the subject's body the denominator.
The term "facialism" or facial prominence was first described in a 1983 study, where it was quantified by a ratio of two linear measurements: one from the top of the head to the chin and another from the top of the head to the lowest visible part of the body.