Document Detail

Reliability of the tear break-up time technique of assessing tear stability and the locations of the tear break-up in Hong Kong Chinese.
MedLine Citation:
PMID:  1454305     Owner:  NLM     Status:  MEDLINE    
The measurement of tear break-up time (TBUT) in assessing stability of the tear film is somewhat controversial, even though the technique is widely used. We examined reliability of the technique within and among examiners and conclude that measurements of TBUT can be made reliably; full-beam observation of the cornea is preferable to scanning the cornea with a narrow slit in making the measurements. There may be differences in TBUT measurements made in the same subjects among examiners, but these differences are smaller with more experienced practitioners. In the Hong Kong Chinese (HK-Chinese), tear break-up appears to be more likely to first occur in the inferior periphery of the cornea. In this population mean TBUT is about 7.20 s; assuming a Gaussian distribution of TBUT values, 2.1 s should be adopted as the lower limit for normal TBUT in HK-Chinese.
P Cho; B Brown; I Chan; R Conway; M Yap
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Optometry and vision science : official publication of the American Academy of Optometry     Volume:  69     ISSN:  1040-5488     ISO Abbreviation:  Optom Vis Sci     Publication Date:  1992 Nov 
Date Detail:
Created Date:  1993-01-06     Completed Date:  1993-01-06     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  8904931     Medline TA:  Optom Vis Sci     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  879-85     Citation Subset:  IM    
Department of Optometry and Radiography, Hong Kong Polytechnic Hung Hom.
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MeSH Terms
China / ethnology
Cornea / physiology*
Hong Kong
Observer Variation
Ophthalmology / methods
Reproducibility of Results
Tears / physiology*

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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