TearLab

Listing Results TearLab

Frequently Asked Questions

• How does nibut software assess the tear film?

  To assess the NIBUT, the software asses the different segments and distortion in the reflected mires. A recent study reported that the pattern of tear break-up may suggest which layer of the tear film is primarily affected, such as aqueous tear layer/secretory mucins or surface epithelial layer/membrane-associated mucins.

• How is tear break up time measured?

  Tear film instability is usually evaluated by a simple tear break-up time (BUT) test using a vital dye, fluorescein. Some of the newer imaging techniques offer non-invasive ways to measure BUT. Tear osmolarity can be directly measured using a point-of-care device in-office.

• How is the stability of tear film measured?

  Tear film stability is measured automatically using a specific software through detection of break-up on the image reflected from the ocular surface, either a grid pattern or placido disk images. To assess the NIBUT, the software asses the different segments and distortion in the reflected mires.

• Which is a feature of the tearlab osmolarity system?

  Analytical Variability of the TearLab Osmolarity System The TearLab Osmolarity System has demonstrated the ability to measure nanoliter volumes of tear fluid with the same analytical performance as laboratory osmometers (Table 1). Precision and accuracy are a reflection of repeatability.

• How does the tearlab osmolarity test card work?

  How it works. The TearLab Osmolarity Test Card, in conjunction with the TearLab Osmolarity System, provides a quick and simple method for determining tear osmolarity using nanoliter (nL) volumes of tear fluid collected directly from the eyelid margin. The Test Card is held by the Osmolarity Test Pen, for safe collection.

• What is the purpose of the tearlab system?

  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.

• When to know if your tear osmolarity is normal?

  Tear osmolarity is informative when the results are abnormal or normal. An elevated reading, >300 mOsm/L, indicating loss of homeostasis.† OR, When the inter-eye difference is >8 mOsm/L, indicating instability of the tear film.† A symptomatic patient with normal tear osmolarity may not have dry eye.

• How is osmolarity determined for dry eye disease?

  Using patients selected from the general patient population, osmolarity was found to have 88% specificity, 75% sensitivity in mild/moderate disease and 95% sensitivity in severe disease at a diagnostic cutoff of 308 mOsms/L. Osmolarity values above 308 mOsms/L are therefore indicative of dry eye disease1.