tårfilms

Tårfilms, also known as tear films, are the thin, transparent layers of fluid that coat the surface of the eye. They play a crucial role in maintaining eye health, protecting the cornea, and ensuring clear vision. The tear film consists of three primary layers: the lipid layer, the aqueous layer, and the mucin layer.

The lipid layer, produced by the meibomian glands, sits on the outermost surface of the tear film. Its primary function is to prevent evaporation of the underlying aqueous layer, thereby maintaining tear stability. The aqueous layer, secreted by the lacrimal gland, provides nourishment to the cornea and contains antibodies that help protect against infections. The innermost mucin layer, produced by goblet cells in the conjunctiva, helps the tear film adhere to the eye’s surface.

Disruptions in the tear film can lead to dry eye syndrome, a common condition characterized by symptoms such as dryness, irritation, redness, and blurred vision. Factors such as aging, prolonged screen use, environmental conditions, and certain medications can contribute to tear film instability. Proper hydration, regular eye care, and environmental adjustments, such as using artificial tears or adjusting screen brightness, may help alleviate symptoms.

The tear film is continuously renewed through a process called the blink reflex, where the eyelids spread the tears evenly across the eye’s surface. When this process is compromised, it can result in incomplete coverage of the cornea, leading to discomfort and potential damage. Maintaining a healthy tear film is essential for optimal eye function and overall ocular health.