Preaponeurotic Fat: the Fat of the Upper Eyelid
Quick facts
- Definition
- A fat compartment of the upper eyelid, behind the orbital septum and in front of the levator aponeurosis.
- Location
- Upper eyelid, between the orbital septum and the aponeurosis of the levator muscle.
- Relation to the gaze
- Too little fat can leave the eyelid hollow; too much can weigh it down.
- Distinction
- It is different from the deep fat pads of the orbit.
Preaponeurotic fat is the fat compartment of the upper eyelid. It lies just behind the orbital septum and in front of the aponeurosis of the levator palpebrae superioris muscle. It is part of the set described in eyelid fat pads.
Why does it matter for the gaze?
The amount of this fat helps define the look of the upper eyelid. When there is little, with age or after weight loss, the area can look hollow and the upper eyelid sulcus gets deeper. When there is a lot, the eyelid can look heavier. This reading enters the assessment of the upper third.
| Situation | What you observe |
|---|---|
| Less fat | Hollow eyelid, deeper sulcus |
| More fat | Fuller or heavier eyelid |
| Excess skin | A fold of skin over the eyelid, which is another cause |
Is it the same fat as the under-eye area?
No. Dark circles and the tear trough relate to the lower eyelid and to infraorbital fat. The upper eyelid has its own anatomy, and the assessment is done separately. See also hyaluronic acid in the upper eyelid sulcus.
Frequently asked questions
Where is the preaponeurotic fat?
It is in the upper eyelid, behind the orbital septum and in front of the aponeurosis of the levator palpebrae muscle. It contributes to the natural fullness of the area above the eye.