title: Nasolabial fold angle measurement using anterior segment optical coherence tomography in normal subjects.
abstract: OBJECTIVE
  The human nasolabial fold angle (NFA) has been measured using MRI and photogrammetry and has been shown to decrease with age. The authors aimed to evaluate a novel method using optical coherence tomography to measure the NFA.
  
  
  METHODS
  In this cross-sectional observational series, the authors used anterior segment optical coherence tomography (ASOCT) to image the NFA of both cheeks of 126 subjects aged 21 to 79 years. A dental vinylpolysiloxane custom-designed mould was used as a chin rest. The mean of 3 scans on each side was calculated and analysis of variance, multiple comparisons, and multiple linear regression were carried out using SPSS 11.0.
  
  
  RESULTS
  Sixty-one subject (48.4%) were men and 65 (51.6%) were women. Mean age was 50.6 +/- 16.8 years (range, 21-79 years). The ASOCT successfully imaged the NFA in all subjects. Mean right and left NFA were 144.4 degrees +/- 17.1 degrees and 145.4 degrees +/- 17.7 degrees. The NFA were dissimilar between the 6 age categories by decade (p < 0.001). Age was the significant predictor of NFA, accounting for 55% of NFA variation. Every year accounted for a decrease of 0.78 degrees (p < 0.001) and 0.80 degrees (p < 0.001) for the right and left cheeks, respectively. Male sex resulted in an increase in NFA of 5.4 degrees (p = 0.007) and 4.0 degrees (p = 0.06) in the right and left cheeks, respectively.
  
  
  CONCLUSIONS
  The NFA decreases with age and increases with male sex and can be measured with ASOCT accurately and easily.
authors: Singapore National Eye Centre and Singapore Eye Research Institute, Yong Loo Lin School of Medicine, National University of Singapore, Singapore. marcus.lim.c.c@singhealth.com.sg
authors: Marcus C C
authors: MC
authors: Lim
authors: Han T
authors: HT
authors: Aung
authors: Tin
authors: T
authors: Aung
authors: Audrey L G
authors: AL
authors: Looi
mesh_terms: D000328:Adult; D000368:Aged; D000375:Aging / Q000502:physiology*; D002610:Cheek / Q000033:anatomy & histology*; D003430:Cross-Sectional Studies; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D009666:Nose / Q000033:anatomy & histology*; D012016:Reference Values; D012737:Sex Factors; D041623:Tomography, Optical Coherence; D055815:Young Adult