What does the nasolabial angle measurement depend on?

The measurement of the nasolabial angle primarily depends on nose-lip morphology. This angle is formed between two lines: one drawn from the base of the nose to the upper lip, and the other from the upper lip to the lower lip. The shape and position of the nose relative to the lips dictate how this angle is perceived. Variations in nasal projection and the curvature of the lip significantly influence the measurement of the nasolabial angle.

While factors such as age, gender, and ethnicity can influence overall facial aesthetics and may indirectly affect the nasolabial angle, they do not have as direct an impact on the measurement itself as the morphology of the nose and lips. Thus, it is ultimately the anatomical features in that area that determine the specifics of the nasolabial angle.