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The Only Human Body Part That Doesn't Have Blood Supply

The cornea is the transparent, front layer of the eye. As a result of the cornea's work, light is focused precisely into the retina, allowing for sharp vision.

Is there a blood supply to the cornea?

The cornea receives its oxygen supply from the air rather than the bloodstream. Because the cornea is the body's quickest-healing tissue, most corneal abrasions close up within 24 to 36 hours.

The use of contact lenses can restrict the amount of outside oxygen reaching the eye, which is an issue. This can lead to corneal neovascularization (the growth of blood vessels in the cornea) even with gas-permeable lenses. Modern silicone hydrogel lenses greatly ameliorate or do away with this issue.

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