Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/29922
Title: Mechanical manipulation of the lids and tear break-up time measurements in Hong Kong Chinese
Authors: Brown, B
Cho, P 
Yap, MKH 
Issue Date: 1993
Publisher: Wiley-Blackwell
Source: Ophthalmic and physiological optics, 1993, v. 13, no. 3, p. 233-238 How to cite?
Journal: Ophthalmic and physiological optics 
Abstract: We measured tear break-up time (TBUT) after lid-rubbing in a single masked experiment, and found that TBUT was unaltered. A further single masked experiment in which non-invasive tear break-up time (NITBUT) was measured after the lids were raised as if to apply fluorescein also showed no effect of this interference with the lids. An experiment in which fluorescein was applied either with the lid raised or not raised during fluorescein application, again with the experimenter masked with respect to treatment, also produced no significant difference in TBUT. When we measured TBUT with the lid raised so that it was not in contact with the cornea, there was no difference in TBUT for the group between the 'lifted' and 'non-lifted' eye; some subjects showed substantially shorter TBUT values, while others showed substantially longer TBUT values. These findings are surprising in view of the concerns expressed in the literature regarding the sensitivity of the tear film to mechanical interference, and suggest that the tear film is more resistant to disruption than has previously been thought.
URI: http://hdl.handle.net/10397/29922
ISSN: 0275-5408
EISSN: 1475-1313
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