Considerations in Contact Lens Use Under Adverse Conditions Proceedings of a Symposium (1991) / Chapter Skim
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Environmental Conditions and Tear Chemistry
Environmental Conditions and Tear Chemistry
Pages 34-37
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From page 34... ...
Both of these aspects will be briefly considered. At the outset it should be said that tear changes from environmental effects are a multifaceted topic, and I will select just a few of the possible features, namely tear pH, buffering, proteins in general, and enzymes.
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From page 35... ...
Tear pH responses to incremental titrations with acid and base can be compared with pH responses of an unbuffered reference solution. The enhanced resistance of the nonaqueous tear components to the pH change is a measure of the magnitude of tear buffering.
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From page 36... ...
This feature becomes even more relevant given the recent information on carbon dioxide accumulation beneath hydrogel contact lenses. ACID-BASE INFLUENCES ON CONTACT LENSES The role of tear fluid buffering in damping tear pH changes may also influence the success of contact lens wear.
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From page 37... ...
CONCLUSION In summary, the tear fluid is unique among body fluids because of its exposed situation. The subsequent environmental challenges do bring about changes in its characteristics, the tear chemistry role being to ensure that the health of the underlying tissues is sustained throughout.
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