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A video is published online only. To view these files please visit the journal online (http://bjo.bmj.com).
This study was presented as a poster at the 9th Congress of International Society of Dacryology and Dry Eye (16–18 May 2008) in Istanbul.
Competing interests None.
Patient consent Obtained.
Ethics approval Ethics approval was provided by the local ethics committee of Ankara Research and Training Hospital, Ministry of Health.
Provenance and peer review Not commissioned; externally peer reviewed.