The tear lipid layer will be studied before and after the use of an over-the-counter eye drop (NovaTears, Novaliq GmbH, Heidelberg, Germany) using a Stroboscopic Video Color Microscope, which is non-invasive.
The purpose of this study is to explore the tear lipid layer quantitatively and qualitatively before and after use of a perflurohexyloctane eye drop (NovaTears)