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. Author manuscript; available in PMC: 2011 Jun 1.
Published in final edited form as: Am J Ophthalmol. 2010 Apr 8;149(6):932–938.e1. doi: 10.1016/j.ajo.2010.01.004

Figure 1. A diagram of the instruction for measuring tear meniscus variables during blinking.

Figure 1

Two consecutive blink actions were recorded by OCT during both normal and delayed blinking. The frames acquired immediately before (checkpoint A, C) and after (checkpoint B, D) each blink action were processed to yield tear meniscus variables. The mean values of checkpoint A and C were defined as the tear meniscus variables before blink. Similarly, the mean values of checkpoint B and D were defined as the tear meniscus variables after blink. The tear meniscus variables at the beginning and the end of the open eye period were obtained from checkpoint B (after first blink) and checkpoint C (before second blink), respectively.