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Tear protein recovery increases with Schirmer strip wetted length across individual eyes, although there is wide variation. The total amount of protein (μg) recovered from each tear strip was plotted versus the Schirmer strip wetted length (mm). Each data point represents one sample from one eye. Some samples were collected from different eyes of the same participant; therefore, some individuals are represented more than once (n = 47 samples from 37 individuals).
