TearLab Osmolarity System

Hyperosmolarity has been described in the literature as the primary marker of tear film integrity. When the quantity or quality of secreted tears is compromised (known as aqueous deficient or evaporative Dry Eye Disease), increased rates of evaporation lead to a more concentrated tear film(increased osmolarity) that places stress on the corneal and conjunctiva.

The TearLab Osmolarity System is the first objective and quantitative test for diagnosing and managing Dry Eye patients.

TearLab is a noninvasive test which gives fast and accurate results in seconds using only 50 nanoliters (nL) of tear film to diagnose Dry Eye Disease. It gives a clear number to help improve patient compliance. TearLab is a great aid in the diagnosis and monitoring of Dry Eye Disease.

The TearLab Osmolarity System is intended to measure the osmolarity of human tears to aid in the diagnosis of dry eye disease in patients suspected of having dry eye disease, in conjunction with other methods of clinical evaluation.

TearLab, is the first objective and quantitative measurement for diagnosing and managing Dry Eye Disease.
The osmolarity data allows patients to understand their level of disease.

What does TearLab Osmolarity tell me?

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Abnormal tear osmolarity is a failure of homeostatic osmolarity regulation. Elevated osmolarity can cause less regulation of the tear film, more damage to the ocular surface, and more inflammation.


Based on the results of a 300 patient trial that was presented at the 2009 American Academy of Ophthalmology, osmolarity was found to have correctly identified 88% of normal subjects, 75% of mild/moderate disease subjects, and 95% of severe disease subjects at a diagnostic cut-off of 308 mOsms/L.1 Therefore, osmolarity values above 308 mOsms/L are generally indicative of dry eye disease.