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Dry eye syndrome is one of the most common diagnoses encountered in ophthalmology. It is a multifactorial disease of the tears and ocular surface that results in symptoms of discomfort, visual disturbance and tear film instability with potential damage to the ocular surface. It is accompanied by increased osmolarity of the tear film and inflammation of the ocular surface.1 The prevalence of dry eye symptoms increases with age and it affects 80% of the population over the age of 80.2 Patients usually complain of gritty, sandy foreign body sensation and visual blurry vision that clears temporarily upon blinking which is attributed to tear film disruption over the cornea. Conventional non-invasive techniques for the diagnosis of dry eye include quantitative assessment of tear volume, tear film stability, tear dynamics …
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