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Human Tear pHDiurnal Variations
Leo G. Carney, OD, PhD;
Richard M. Hill, OD, PhD
Arch Ophthalmol. 1976;94(5):821-824.
Abstract
• 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.
Author Affiliations
From the College of Optometry, Ohio State University, Columbus, Ohio.
Footnotes
Submitted for publication June 6, 1975.
Reprint request to 338 W 10th Ave, College of Optometry, Ohio State University, Columbus, OH 43210 (Dr Carney).
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