Diurnal variation in precorneal tear film stability.
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.
Patel
S
S
Department of Ophthalmic Optics, Glasgow College of Technology, Scotland.
Bevan
R
R
Farrell
J C
JC
D000328:Adult; D055598:Chemical Phenomena; D002627:Chemistry, Physical; D002940:Circadian Rhythm; D006801:Humans; D013666:Tears / Q000502:physiology*