Fig. 3
Representative image of a normal tear microdesiccate as observed by transmitted-light microscopy with bright-field illumination. A tear microdesiccate was produced from 1 µL of a tear sample and then observed with a microscope fitted with a 10× eyepiece and a 2.5× objective lens and a universal 5-position condenser system turret. Zone I is seen as a homogeneous bulky continuous structure that surrounds a mass of highly diverse poorly defined crystalloids