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Human Tear pH. Diurnal Variations

By Leo G. Carney and Richard M. Hill


Using a closed chamber microelectrode system, the tear pH levels of sixteen subjects were monitored throughout the waking extent of five days. In addition to the absolute mean pH differences found among subjects, diurnal patterns of pH change could be identified for the majority. The amplitudes and periods of these cycloid patterns, however, were distinctive to each individual. Also, tear pH levels following periods of prolonged eye closure were found to be notably more acid than those associated with the waking hours

Topics: 111300 OPTOMETRY AND OPHTHALMOLOGY, Circadian Rhythm, Hydrogen, Ion Concentration, Tears/, analysis, Adult, Female, Humans, Male, Methods, Sleep, Wakefulness
Publisher: American Medical Association
Year: 1976
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