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Diurnal variation in precorneal tear film stability
S Patel1, R Bevan, J C Farrell
1Department of Ophthalmic Optics, Glasgow College of Technology, Scotland.
American Journal of Optometry and Physiological Optics
|March 1, 1988
Abstract:
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.