The TearLab osmolarity system is a point‑of‑care device that measures the osmolarity of tears and is used to diagnose and monitor dry eye disease. The published evidence summarised in this briefing comes from 6 non‑randomised studies in adults on the value of osmolarity as a biomarker for dry eye disease. Four studies of limited quality showed that tear osmolarity either predicted dry eye disease or correlated with other dry eye tests. Two studies found no or limited correlation. The average cost for TearLab testing per person, including capital equipment and single‑use components, is £16.58 excluding VAT.
Published December 2015
NICE page: https://www.nice.org.uk/advice/MIB47