title: Correlation of lipid layer thickness measurements with fluorescein tear film break-up time and Schirmer's test.
abstract: OBJECTIVE
  This study correlates measurement of lipid layer thickness (LLT) with two frequently used dry eye tests, fluorescein break-up time (FBUT) and Schirmer's test with anaesthesia (STA).
  
  
  METHODS
  Subjects (n = 44 eyes) with symptoms of dry eye and positive results for dry eye with either FBUT or STA or both were selected. Quantification of LLT was performed by the observation of colour interference patterns in zones of specular reflection using a custom-designed instrument.
  
  
  RESULTS
  All correlations among pairs of tests were strong and exhibited a significance of P < 0.000: STA with FBUT, Pearson's correlation 0.653; STA with LLT, 0.764; FBUT with LLT, 0.751. When LLT was high, ie > or = 120 nm, which occurred in 14 eyes, STA was also elevated in those eyes and FBUT was high in 13 of the 14 eyes. When LLT was low, ie < or = 60, which occurred in 22 eyes, STA was below normal in 14 of the 22 eyes, and FBUT was below normal in 15 of the 22 eyes. These clinical observations paralleled the statistical findings computed from the entire data set.
  
  
  CONCLUSIONS
  The correlations demonstrated in this study support the premise (1) that measurement of LLT is a reliable test for the diagnosis of dry eye, and (2) that aqueous deficiency and lipid deficiency, as they apply to dry eye disorders, are not mutually exclusive.
authors.affiliation: Schepens Eye Research Institute, Boston, MA, USA.
authors.forename: M A
authors.initials: MA
authors.lastname: Isreb
authors.forename: J V
authors.initials: JV
authors.lastname: Greiner
authors.forename: D R
authors.initials: DR
authors.lastname: Korb
authors.forename: T
authors.initials: T
authors.lastname: Glonek
authors.forename: S S
authors.initials: SS
authors.lastname: Mody
authors.forename: V M
authors.initials: VM
authors.lastname: Finnemore
authors.forename: C V
authors.initials: CV
authors.lastname: Reddy
mesh_terms: D000328:Adult; D000368:Aged; D000772:Anesthesia, Local; D015352:Dry Eye Syndromes / Q000175:diagnosis* / Q000378:metabolism; D005260:Female; D019793:Fluorescein; D006801:Humans; D008055:Lipids / Q000032:analysis* / Q000172:deficiency; D008297:Male; D008875:Middle Aged; D015203:Reproducibility of Results; D013666:Tears / Q000378:metabolism*
chemical_list: D008055:Lipids; D019793:Fluorescein