Tårfilmskvalitet

Tårfilmskvalitet refers to the physical and chemical properties of the tear film that covers the surface of the eye. A healthy tear film is crucial for maintaining clear vision, protecting the ocular surface from pathogens, and providing comfort. It is composed of three distinct layers: an outer lipid layer, a middle aqueous layer, and an inner mucin layer.

The lipid layer, secreted by the meibomian glands in the eyelids, prevents rapid evaporation of the aqueous layer. Dysfunction of these glands can lead to a deficient lipid layer, resulting in increased tear evaporation and dry eye symptoms. The aqueous layer, produced by the lacrimal glands, constitutes the bulk of the tear film and provides hydration and oxygen to the cornea. Its volume and composition are vital for maintaining a stable tear film. The mucin layer, secreted by goblet cells in the conjunctiva, adheres the aqueous layer to the corneal epithelium, ensuring even spreading and lubrication.

Several factors can affect tårfilmskvalitet, including age, hormonal changes, environmental conditions, systemic diseases like Sjögren's syndrome, and the use of certain medications. Insufficient tear production, excessive evaporation, or poor tear spreading can all lead to a compromised tear film, a condition commonly known as dry eye disease. Symptoms of poor tårfilmskvalitet can range from mild irritation and a gritty sensation to blurred vision and significant discomfort. Diagnosis often involves evaluating tear film stability, tear breakup time, and the presence of other ocular surface abnormalities.