Orbital vector
Whether the bone under your eye sits ahead of the eye or behind it. Seen from the side.
The orbital vector describes the front-to-back relationship between the eyeball and the bone supporting it, judged in profile. A positive vector means the infraorbital rim and cheek sit ahead of the front of the cornea — the eye is supported from below. A negative vector means the eye projects further forward than the bone underneath, which produces the hollow, tired-looking lower lid the term is usually invoked to explain. It is genuine clinical vocabulary: oculoplastic surgeons use it to predict how an eyelid will behave after surgery, which is what it was defined for. Two things follow. It is a profile measurement, so no front-facing photograph and no front-facing tool — including ours — can give you one. And it is bone, so it is changed by fillers, implants or surgery, and not by anything else.
This one cannot be measured from a front-facing photograph, so there is no tool for it here.