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February 1981

Normal Human Tear pH by Direct Measurement

Arch Ophthalmol. 1981;99(2):301. doi:10.1001/archopht.1981.03930010303017

• Tear pH was measured in 44 normal subjects by immersing the tip of a microcombination glass pH probe in the tear fluid in the inferior cul-de-sac. The normal pH range was 6.5 to 7.6; the mean value was 7.0. This method provides a rapid and accurate measure of tear pH and may better our understanding of tear physiology and tear buffering capacity.