The facial contour feature projects the face in 3D space and presents its relief in the form of geographic contour lines. It turns three-dimensional facial data into a readable line drawing, giving hollowing, accumulation and laxity a more intuitive entry point for observation.
How to read the contour lines
On a map, the closer the contour lines, the steeper the slope; facial contours follow a similar logic. Denser lines usually mean more pronounced local relief and may form a hollow area, commonly at the tear trough, eye socket and temple; more even, sparser lines usually mean gentler facial relief.
The position and shape of the lines matter too. Lines that shift downward and accumulate may suggest soft-tissue descent or midface laxity; lines that gather and close high on the face usually indicate better soft-tissue support and a firmer face.
Three dimensions to observe
1. Line density: used to judge the degree of local relief; dense areas are worth a closer look in the consultation.
2. Line position: downward shift and accumulation may suggest soft-tissue descent; gathering and closing high on the face usually indicates better support.
3. Line shape: step-like folding or breaks may suggest layered facial tissue, forming structural changes such as nasolabial folds and marionette lines; asymmetric lines on the left and right may suggest unilateral volume loss or uneven soft-tissue laxity.
Technical highlight: keeping geometric change on record
Compared with a mirror or a 2D photograph, early shallow aging such as early tear troughs and temple hollows is hard to distinguish; through line density and the shape of breaks, the feature shows subtle hollows and soft-tissue displacement, helping observe early facial changes.
By comparing the completeness and height difference of the contour lines on both sides of the face, the degree of asymmetry can be expressed as geometric data as a reference for assessment. Conventional photo comparison is easily affected by lighting and head angle, whereas contour lines are based on geometric computation and reduce the influence of these external conditions on before-and-after comparison.
Facial contours are a 3D quantitative facial examination tool that turns three-dimensional facial data into an intuitive line image, supplementing information that 2D images struggle to show; in both preoperative plan discussions and postoperative follow-up, it can output visual examination results as a reference for facial assessment.
This article is based on a CASZM WeChat article. View the original article