The global mystery of hazel-colored eyes

Eye see you, says the cornea

 The cornea is the only part of the human body with no blood supply. Unlike other tissues, it remains crystal clear by absorbing oxygen directly from the air rather than relying on blood circulation.

To stay healthy, the cornea draws oxygen from tear fluid and the aqueous humor, the clear liquid inside the eye that nourishes it. This unique adaptation ensures perfect transparency, allowing light to pass through unobstructed for sharp, clear vision.

However, wearing contact lenses for too long can limit oxygen absorption, leading to hypoxia, a condition where the cornea swells due to lack of oxygen.

However, wearing contact lenses for too long can limit oxygen absorption, leading to hypoxia, a condition where the cornea swells due to a lack of oxygen.