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Handheld Tear Film Lipid Layer Thickness and Non Invasive Tear Break Up Time Assessment Tool

Lipid layer is part of the tear film responsible for ocular surface lubrication and prevention of aqueous layer evaporation. Nowadays, dysfunction of this tear film layer is recognized as responsible for the majority of tear film dysfunction cases [1,2]. Yet, in the same time, no method of tear film lipid layer visualization became a part of routine clinical practice. Tearscope and Tearscope plus instruments, designed for lipid layer examination, were not widely accepted by general ophthalmologists or optometrists primarily because of their price, and furthermore are not being manufactured anymore [3]. Several methods, their use mainly confined to research or specialized dry eye clinics, assess Meibomian gland function (Meibometry, Meibomian gland expression, Meibography etc.). Currently, several sophisticated lipid layer assessent instruments are being developed, but despite their precision, their complexity and price will most likely limit their use to research and specialized dry eye clinics. Without questioning diagnostic capabilities of the above mentioned tests and equipment, it is quite clear that they did not find widespread clinical use, either due to the price of the equipment or to its impracticality, requiring time to perform or unacceptably interfering with other diagnostic procedures that are vital part of the routine clinical practice.