tranenfilms
Tranenfilms, also known as tear film, is a thin, multi-layered fluid that coats the ocular surface between the eyelids and the external environment. It serves as a lubricant for the eyeball, provides a smooth refractive surface for vision, and acts as a barrier to dust and microorganisms. The tear film is traditionally described as comprising three main layers: a lipid (oil) layer produced mainly by the meibomian glands, an aqueous (watery) layer produced by the lacrimal glands, and a mucin layer produced by conjunctival goblet cells and corneal epithelium. These layers work together to protect, nourish, and stabilize the tear film.
The tear film is dynamic and constantly refreshed with every blink. The lipid layer reduces evaporation, the
Clinically, tear film health is assessed using tests such as tear breakup time (TBUT), Schirmer test for