Human tear buffering capacity

Archives of Ophthalmology
L G Carney, R M Hill


With the use of a closed chamber microelectrode system, we measured the relative buffering capacities of 490 human tear samples from young healthy adults. The buffering capacities of the 457 waking-hour samples did show small but regular oscillations that were similar to those previously reported for blood and tear pH, but only rarely did the buffering capacity of one sample approach double that of another. The buffering capacities of 33 tear samples, associated with periods of prolonged eye closure (sleep), were not significantly different (P less than 0.5) from those of the open eye.


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Related Concepts

Circadian Rhythms
Hydrogen-Ion Concentration
Sleep, Slow-Wave
Tears Body Substance

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