Nasal tip projection
There are two methods to measure tip projection :
– Baum ratio: calculated by dividing the length of the nose (calculated from the nasion – (between the eyes)– to the subnasal point) by the length of a perpendicular line (passing through the pronasion) to a vertical line joining the pronasion and the subnasal point.
The ideal projection has a Baum ration of 2.8: 1, while an Asian nose tip has a Baum ratio of 3.
– Simons ratio: calculated by dividing the subnasion-pronasion distance by the subnasion-upper lip distance.
The ideal projection has a Simons ratio of 3, the Asian nasal tip has a Simons ratio of 1.5.