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Related Experiment Videos

Human tear responses to alkali

R M Hill, L G Carney

    Investigative Ophthalmology & Visual Science
    |February 1, 1980
    PubMed
    Summary
    This summary is machine-generated.

    Tear fluid exhibits significantly higher buffering capacity at pH 10 and above, potentially due to protein denaturation. This finding supports earlier research on corneal tissue buffering capacity.

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    Area of Science:

    • Ophthalmology
    • Physiological Chemistry
    • Biophysics

    Background:

    • The buffering capacity of tear fluid is crucial for maintaining ocular surface health.
    • Previous studies by Friedenwald indicated buffering capacity in corneal tissue at higher pH levels.

    Purpose of the Study:

    • To measure the buffering capacities of human tear samples.
    • To investigate tear fluid responses to varying alkali challenges.

    Main Methods:

    • Utilized a closed-chamber microelectrode system.
    • Analyzed over 100 tear samples from seven subjects.
    • Assessed buffering capacity under different pH conditions.

    Main Results:

    • Distinct individual variations in buffering capacity were observed.

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  • A substantially greater buffer capacity was consistently found in tears at pH 10 and above.
  • This enhanced buffering may be linked to protein denaturation.

    • Conclusions:

    • Human tear fluid demonstrates a notable increase in buffering capacity at high pH levels (≥10).
    • The observed phenomenon aligns with prior findings on corneal tissue.
    • Protein denaturation is a potential contributing factor to the elevated buffering capacity in tears.