Question

state the functions of tears

Answer 1

Preventing dryness
Tears prevent dryness by coating the surface of the eye, as well as protecting it from external irritants.
Supplying oxygen and nutrients to the eyes
There are no blood vessels on the surface of the eye, so oxygen and nutrients are transported to the surface cells by tears.
Preventing infection
Foreign bodies that enter the eye are washed out by tears. Moreover, tears contain a substance called lysozyme, which has an antibacterial action, and works to prevent invasion and infection by microbes.
Healing damage to the surface of the eye
Tears contain components that heal damage to the surface of the eye.
Creating a smooth surface on the eye
Tears lubricate and smooth the surfaces of our eyes so that light is refracted correctly, enabling us to see clearly.
ITS LONG BUT VERY EASY HOPE IT HELP S

Answer 2

This layer makes up the majority (95％) of tears, and contains various substances including proteins. It performs the key functions of tears, such as supplying nutrients to the cornea, preventing infection and healing damage. It is secreted by the lacrimal gland on the underside of the upper eyelid.