What does the aqueous layer of the tear film contain?

The aqueous layer of the tear film plays a critical role in maintaining eye health and comfort. It is primarily composed of a complex mixture that includes inorganic salts, glucose, urea, proteins, and glycoproteins.

Inorganic salts help to maintain osmotic balance and provide essential ions that contribute to the tear film's stability and function. Glucose serves as an energy source for corneal cells, ensuring they remain healthy and function optimally. Urea contributes to the tear film’s nutrient content and helps in waste removal from the ocular surface.

Proteins and glycoproteins in the aqueous layer are vital for various functions, such as antimicrobial defense, lubrication, and cell signaling. These components collectively help to protect the cornea from infection, provide moisture to the surface of the eye, and ensure that the tear film remains stable and functional.

This composition outlines the multifaceted role of the aqueous layer in nourishing and protecting the eyes, making it essential for overall ocular health.