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Observation reveals changes in precorneal tear film stability, suggesting daily patterns in eye moisture.
The stability of the precorneal tear film as inferred from the tear thinning time (TTT) appears to vary over a single 12‐h period. The form of this variation is subject dependent. For the average patient the stability is low early in the morning, and tends to rise to equilibrium level between 10:00 a.m. and 12 noon.
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Patel et al. (1988) studied this question.
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