The tear film is a complex mixture of substances that are produced by various sources on the surface of the eye, such as the lacrimal gland, accessory lacrimal glands, meibomian glands, and goblet cells. This film covers the surface of the eye, which includes the corneal and conjunctival epithelia, serving as a barrier between these tissues and the outside world. It plays a crucial role in maintaining the health and protection of the eye surface, as well as ensuring clear vision, since the tear film acts as the eye’s initial refractive surface.
Tear-film