Objective Assessment of Tip Projection and the Nasolabial Angle in Rhinoplasty

Abstract

To provide an objective method to measure the extent of nasal tip projection and the nasolabial angle.Design: We retrospectively studied preoperative and postoperative images using a novel approach. The constant position of the cornea in lateral views and the diameter of the iris in frontal views were used to standardize and compare digitalized images of patients before and after surgery. We tested this objective assessment technique using the digitized slides of patients with saddle nose deformities and measured changes in their nasal tip projection and nasolabial angle. We included 63 patients who had undergone an open rhinoplasty with the I-beam technique by the same surgeon over a 7-year period. We tested the reproducibility of these measurements with 10 independent investigators. We also determined whether the measurements using this objective technique correlated with the surgeon's or patients' subjective assessments of the outcome.

Toward a Universal, Automated Facial Measurement Tool in Facial Reanimation

“…All photographs were analyzed using manual importing of photographs into Photoshop and scaling the photographs to the iris diameter (11.8 mm in humans) in the picture for normalization, as has been reported by others. 45 A horizontal line was constructed through the pupils and a vertical line drawn to bisect the interpupillary line to facilitate measures using the built-in measuring tool. The time it took to perform this analysis for each photograph was recorded.…”

Defining the Protruding Ear

“…This is permissible because of the extraordinary constancy of the iris diameter from the age of 5 years with a very narrow spread (11.5 T 0.5 mm). 11Y16 This method has been previously described for calibration of photographs in both children as adults 17,18 and enables reliable life-size measurements of preexisting photographs without incorporated scale.…”

Immediate Effects of Different Steps of Rhinoplasty on Nasolabial Angle and Tip Projection

“…We were then able to assess the exclusive effects of each maneuver. We used the method of Spörri et al 15 to measure NLA and NTP. In this technique, reproducible points (tragus, lateral canthus, and vermilion border) are used to measure NLA and NTP.…”