Question

we know that our eye receive O2 by direct diffuse of air with atm but while sleeping how do our eye receive O2??? ​

Answer 1

Answer:

That's because when you sleep with your contact lenses in, you're depriving your corneas of oxygen. ... "It's not ideal for oxygen exchange." The cornea receives oxygen from the air when you are awake, but when you are asleep, it gets nourishment and lubrication from tears and a gelatinous fluid called the aqueous humor....

Answer 2

Answer:

Without blood vessels the cornea must get it's oxygen directly from the air. The oxygen first dissolves in the tears and then diffuses throughout the cornea to keep it healthy. Carbon dioxide is released via the same process back out to the atmosphere.