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What is tear breakup time?

April 26, 2017breakup tear time

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What is tear breakup time?

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This is a test for tear function. When the time interval between a blink and the development of a dry spot in the pre-corneal tear film is less than 10 seconds, it is abnormal. A spot is visible after fluorescein staining, especially with the cobalt blue beam on the slit lamp.