Table 2: Linear facial dimensions and ratio with their corresponding landmarks.

SNFacial linear distancesLandmarks

1Special head heightv-en
2Special face heighten-gn
3Forehead height IItr-n
4Nose lengthn-sn
5Lower face heightsn-gn
6Height of calvav-tr
7Forehead height Itr-g
8Special upper face height Ig-sn
9Interocular distanceen-en
10Nasal widthal-al
11Upper facial widthzy-zy
12Mouth widthch-ch
13Orbital lengthex-en