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 "prominence of the face" was initially defined in a 1983 study, where facial prominence was quantified by a "Facial Prominence Index", which is the ratio of two linear measurements, with the distance from the top of the head to the lowest visible point of the chin serving as the numerator and the distance from the top of the head to the lowest visible part of the subject's body being the denominator.