Computerized photogrammetry used to calculate the brow position index

Area of Science:

• Ophthalmology
• Plastic Surgery
• Medical Imaging

Background:

• The orbital region is critical for facial aesthetics and expression.
• Brow ptosis, a common sign of aging, affects facial harmony and necessitates effective surgical correction.
• Objective measurement of eyebrow position is challenging due to facial curvature, hindering consistent surgical outcomes.

Purpose of the Study:

• To develop and validate a novel method for objectively measuring eyebrow position using computerized photogrammetry.
• To establish the Brow Position Index (BPI) as a reproducible metric for eyebrow assessment.

Main Methods:

• Employed direct anthropometry with digital calipers and indirect anthropometry via computerized photogrammetry on 20 orbital regions from 10 volunteers.
• Defined anthropometric landmarks (endocanthion, exocanthion) to calculate the Brow Position Index (BPI).
• Utilized Student's t test for statistical analysis with a significance level of 5%.

Main Results:

• Computerized photogrammetry yielded BPI values statistically comparable to direct anthropometric measurements (p > 0.05).
• Mean BPI was 84.89 ± 10.30 for photogrammetry and 85.27 ± 10.67 for direct measurements.
• Demonstrated high reproducibility and efficiency of the photogrammetric method.

Conclusions:

• The Brow Position Index (BPI), measured via computerized photogrammetry, is a reproducible and efficient tool for assessing eyebrow position.
• This method addresses the need for objective measurement in the context of brow ptosis and facial aging.
• Facilitates consistent evaluation and planning for brow-lift surgeries.