The cornea obtains oxygen directly from the atmosphere and aqueous humor during sleep
the verdict
SUPPORTED
the evidence backs this
confidence 85/100
The cornea is an avascular tissue that relies on direct exposure to the atmosphere when awake, and obtains oxygen and nutrients from the atmosphere and aqueous humor when the eyes are closed during sleep.
Evidence for · 4
Hypoxia adaptation in the cornea: Current animal models and underlying mechanisms
2021 · cited by 43
The review notes that the avascular cornea acquires its oxygen supply directly or indirectly from the atmosphere and other sources such as closed eyes or the aqueous humor.
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More for · 3
Limbal Metabolic Support Reduces Peripheral Corneal Edema with Contact-Lens Wear
2020 · cited by 18
The computational model highlights that the cornea is suffused with oxygen and metabolites from the atmosphere, limbus, and aqueous humor.
The fibrinolytic system in the cornea: A key regulator of corneal wound healing and biological defense.
2021 · cited by 15
Literature confirms that the cornea receives nutrients and oxygen via diffusion from both tear fluid (atmospheric exposure) and the aqueous humor.
REM phase: An ingenious mechanism to enhance clearance of metabolic waste from the retina.
2021 · cited by 11
Historical context discusses the physiological need to prevent corneal anoxia during sleep when the cornea relies on alternative oxygen/metabolic pathways.