Do you use eye drops several times a day? Did you know that even over-the-counter eye drops can be harmful if used too often? Nearly all multi-dose eye drop bottles contain preservatives (such as benzalkonium chloride), and those preservatives come with potential problems. What is benzalkonium chloride? Benzalkonium chloride (aka BAK or BAC), a quaternary …
What are meibomian glands? Meibomian glands are sebacous (oil) glands located in the upper and lower eyelids. There are more in the upper lid than the lower lid, and they are also larger in the upper lid (1). The glands sit vertically in the eyelids, and their openings are right behind the lash line. The …
What is Demodex? Demodex is an 8-legged, microscopic mite. Two species live on humans: Demodex folliculorum, which are found in the eyelash follicles, and Demodex brevis, which are found in the sebaceous (sweat) and meibomian (oil) glands. These mites live primarily on the face and feed on skin cells and oil in the follicles and glands. They avoid sunlight and …