Tear Film Stabilization (Osmoprotective Effect) (TFS-OE)

Tear film stabilization via osmoprotective effects refers to the use of osmoprotectants to maintain tear film integrity under hyperosmolar conditions. Key molecules include L-carnitine, erythritol, betaine, glycerol, and trehalose, which protect ocular surface cells from osmotic stress, reduce inflammation, and improve tear film stability. These agents are commonly used in artificial tears and contact lens solutions to manage dry eye disease and related disorders.

Other names

Osmoprotection of ocular surfaceTear film osmolarity regulationOcular surface homeostasisHyperosmolarity mitigation in dry eye

Osmoprotectants enter ocular surface epithelial cells via transporters, balancing intracellular osmolality without disrupting normal cellular metabolism. They reduce water loss from the tear film by increasing viscosity or forming protective layers on the ocular surface. Examples include glycerol acting as a humectant to retain moisture and stabilize cell membranes against shrinkage due to high osmolarity, and trehalose preserving corneal/conjunctival cell viability during desiccation by delaying water evaporation from the tear film.