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Related Experiment Videos

Tear osmotic differences across the ocular surface.

W J Benjamin, R M Hill

    Graefe'S Archive for Clinical and Experimental Ophthalmology = Albrecht Von Graefes Archiv Fur Klinische Und Experimentelle Ophthalmologie
    |January 1, 1986
    PubMed
    Summary
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    Tear osmolality varies across ocular surfaces, with differences more pronounced in individuals experiencing dry eye symptoms. These findings suggest localized osmotic variations on the eye.

    Area of Science:

    • Ophthalmology
    • Physiology
    • Biophysics

    Background:

    • Ocular surface tear film osmolality is a critical indicator of ocular surface health.
    • Understanding tear film osmolality variations is essential for diagnosing and managing dry eye disease.

    Purpose of the Study:

    • To investigate the osmolality of non-stimulated tear samples collected from different ocular surface sites.
    • To compare tear osmolality between a healthy subject and one with occasional dry eye complaints.

    Main Methods:

    • Utilized a freezing point depression method to measure osmolality.
    • Collected 502 non-stimulated tear samples (200 nL each) hourly over 6 days.
    • Sampled from four ocular surface sites: mid-superior, mid-inferior, medial canthus, and lateral canthus.

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    Main Results:

    • Mean osmolalities differed significantly between the two subjects (315 mOsm/kg vs. 331 mOsm/kg, P = 0.0004).
    • Significant intersite differences in tear osmolality were observed for both subjects.
    • The subject with dry eye complaints exhibited more prominent and hypertonic osmotic shifts.

    Conclusions:

    • Statistically significant differences in ocular surface osmolality exist between individuals.
    • Osmotic variations across the ocular surface are dynamic and influenced by dry eye status.
    • Further research is needed to explore these patterns in a broader population.