Bayview Optometrics is pleased to provide TearLab testing for patients who routinely suffer from the dry eye sensation.
TearLab is a high-quality, quantitative point-of-care diagnostic test that provides patients with extremely accurate information that is predictive in nature, allowing for more holistic eye care in Cape Cod. It uses the TearLab Osmolarity System, which was designed to measure the osmolarity of human tears to help provide better diagnoses of dry eye diseases in patients who are suspected of suffering from them. This system works in conjunction with other evaluation methods used in clinical settings.
A look at osmolarity
Osmolarity is the measure of the wetness or dryness of a person’s eyes. Abnormal osmolarity occurs when there is a reading of 300 or more mOsm/L, which indicates a loss of homeostasis in the eyes. When the inter-eye difference is more than eight mOsm/L, there is an instability of the tear film that needs to be addressed.
Osmolarity is an extremely important measuring stick for the health of the ocular surface. A patient demonstrating dry eye symptoms who has normal tear osmolarity might not actually have dry eye disease. Instead, based on information from a study of 50 patients with dry eye symptoms who had normal osmolarity, they are most likely to have diagnoses such as allergic conjunctivitis, computer vision syndrome, EBMD, anterior blepharitis, keratoneuralgia, contact lens intolerance or trichiasis.
How TearLab’s osmolarity testing works
The TearLab Osmolarity Test Card works in conjunction with the overall TearLab Osmolarity System to provide a quick, simple method to determine the osmolarity of the ocular surface by measuring nanoliter volumes of tear fluids collected from the margin of the eyelids. That card is then held in place by the Osmolarity Test Pen to ensure safe, proper collection.
The test uses temperature-corrected impedance measurements to provide genral assessments of the osmolarity. After the application of a lot-specific calibration curve, osmolarity can then be calculated, and is displayed as a specific numerical value.
This method is more precise than any other universally accepted point-of-care test and measurement, including measurements of glucose and cholesterol.
TearLab also is beneficial because of how predictive it is. It has a positive predictive value of 89 percent, which means it is 89 percent likely that subjects who have a positive test in TearLab actually have dry eye disease. Not many tests are able to achieve this level of positive predictive value, which is a testament to the TearLab technology and the ingenuity that went into developing the system.
This is just a brief overview of how TearLab osmolarity testing works. If you have dry eyes and are wondering whether you have dry eye disease, this is the most effective test available anywhere on the market. For further information, we encourage you to reach out to the experts at Bayview Optometrics today and we’ll be pleased to provide you with additional information about the test and the options you have to get a clear, reliable diagnosis for dry eye disease and receive the proper eye care in Cape Cod.