Cornea

Cornea explained in an easy to understand way:

Imagine trying to look out a window that has a thin layer of dust on it; it makes everything outside appear slightly blurred and dull. Similarly, the cornea is like that window, but in this case, it's perfectly clean and clear, allowing light to enter your eye sharply and vividly. Just as a dust-free window ensures you see the world outside clearly, the cornea's transparency ensures that light enters your eye accurately, enabling you to see your surroundings with clarity.