Once again, Campbell Eyecare were the first to offer this test in the Highlands.
Osmolarity is a measure how concentrated the tears are measured with a special instrument that takes a small sample of your tears on a sterile gold coated probe. This sample is analysed in seconds on the TearLab unit. Normal tear osmolarity is equivalent to normal blood osmolarity, which ranges from 280-295 mOsm/L. Readings of >300 or where there is an inter-eye difference >8mOsm/L are early indicators of tear film instability. These figures give our optometrists an indication of the best regime for the patient in terms of eye drops and possible supplements.
Because 65%-70% of the total refractive power of the eye occurs at the air-tear interface, if the tear film is unstable, the image quality projected on the retina can be significantly impaired. Patients with high tear osmolarity being measured prior to cataract and refractive (laser) surgery may have variable results, and this could impact surgical planning and hence, surgical outcomes.