Reliability of a portable noninvasive tear break-up time test on Hong Kong-Chinese

Hie Hua Wong

Research output: Journal article publicationJournal articleAcademic researchpeer-review

38 Citations (Scopus)


Seven normal asymptomatic Hong Kong-Chinese (HKChinese) were recruited and their noninvasive tear break-up time (NITBUT) was measured. Measurements were performed eight times over a period of 8 weeks to test the reliability of the NITBUT test over time. The distribution of NITBUT data was positively skewed. The mean (±SD) NITBUT was 16.0 (±9.4) s and the mode was 17.5 s. Friedman two-way analysis of variance revealed no significant difference in the NITBUT taken on different days. For the clinical estimate of the NITBUT, we recommend taking five measures of NITBUT and average the three closest measures and use this as a representative value of tear stability for the subject.
Original languageEnglish
Pages (from-to)1049-1054
Number of pages6
JournalOptometry and Vision Science
Issue number12
Publication statusPublished - 1 Jan 1993


  • Chinese
  • Noninvasive tear breakup time
  • Reliability
  • Variability

ASJC Scopus subject areas

  • Ophthalmology
  • Optometry


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