Brow Ridge / Supraorbital Ridge
The brow ridge (supraorbital ridge) is the bony prominence above the eye sockets — strongly sexually dimorphic and a key masculinity marker.
Definition
The brow ridge, or supraorbital ridge, is the horizontal bony prominence on the frontal bone that runs above the orbits. It is one of the most sexually dimorphic skeletal traits in the human face: men develop a markedly more pronounced ridge during puberty under testosterone influence, while women retain a smoother, flatter forehead. A strong brow ridge casts a shadow over the orbital area, creating the deep-set eye look central to "hunter eyes." It also signals high androgen exposure during development — comparative anatomy studies link ridge prominence to testosterone levels at puberty. Population variation is wide, with some male populations (Northern European, certain Mediterranean) showing average ridges higher than others.
Why it matters
Brow ridge prominence is one of the hardest masculinity markers to fake. Soft tissue (fat, brow position, hair) cannot recreate the underlying bone shadow, which is why brow ridge appearance is one of the most reliable visual cues of male development. In women, a soft brow ridge is a feminine ideal — too much ridge prominence reads as masculine. Aesthetic procedures targeting the ridge include brow bone implants (for masculinization) and brow bone reduction (for feminization, common in facial feminization surgery).
How AI measures it
AI estimates brow ridge prominence from side-profile photos by measuring the forward projection of the brow line relative to the forehead plane. Front-facing photos provide a weaker proxy via the depth of the eye-socket shadow and the brow-to-eye distance. Three-quarter views give the best 2D estimate.
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Frequently asked questions
Is a strong brow ridge always attractive?
In men, generally yes — it pairs with hunter eyes and reads as masculine. In women, a strong ridge is typically rated less attractive because it appears masculinizing.
Can you build a brow ridge naturally?
No — the bone is fixed after puberty. Brow position (low brows over the eye) and body fat reduction can enhance the look of an existing ridge, but cannot create one where there is none.
What surgery changes the brow ridge?
Brow bone implants (for masculinization) add forward projection. Brow bone reduction with frontal sinus setback (for feminization) flattens the ridge. Both are skull-altering procedures with significant recovery.