title: Tear meniscus height determination using the OCT2 and the RTVue-100.
abstract: OBJECTIVE
  To compare anterior segment spectral-domain optical coherence tomography (SOCT) tear meniscus height (TMH) measures with those from the more commonly used time-domain OCT (TOCT).
  
  
  METHODS
  The right eye of 50 healthy subjects had images of their TMH captured with TOCT (OCT2) and SOCT (RTVue-100). Data were acquired using two different anterior segment lenses, the cornea/anterior module-short (CAM-S) and long (CAM-L), on the SOCT. Images were then analyzed for differences in their derived TMH.
  
  
  RESULTS
  The average TMH for TOCT was 0.280 ± 0.139 mm, whereas the mean TMH measured using the SOCT was 0.354 ± 0.163 mm and 0.345 ± 0.167 mm for the CAM-S and CAM-L, respectively. There was a significant difference (p < 0.001) when comparing TOCT with either of the SOCT lenses. There was no statistically significant difference between the CAM-L and CAM-S (p = 1.0). Bland-Altman analysis showed poor agreement between TOCT and SOCT (95% limits of agreement -0.138 to + 0.285 mm for the CAM-S and -0.185 to +0.315 mm for the CAM-L).
  
  
  CONCLUSIONS
  The RTVue-100 produces TMH measurements that are significantly higher than OCT2 in a normal patient population. However, the RTVue-100 showed a number of other advantages over the OCT2 in the measurement and analysis of images. Future work needs to determine the causative factors behind the observed differences.
authors.affiliation: Centre for Contact Lens Research, and School of Optometry, University of Waterloo, Waterloo, Ontario, Canada.
authors.forename: Adam
authors.initials: A
authors.lastname: Keech
authors.forename: John
authors.initials: J
authors.lastname: Flanagan
authors.forename: Trefford
authors.initials: T
authors.lastname: Simpson
authors.forename: Lyndon
authors.initials: L
authors.lastname: Jones
mesh_terms: D000328:Adult; D000869:Anterior Eye Segment / Q000378:metabolism*; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D013666:Tears / Q000378:metabolism*; D041623:Tomography, Optical Coherence / Q000379:methods*; D055815:Young Adult