Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) Corneal Disorders ?
    ### Response:
    Your cornea is the outermost layer of your eye. It is clear and shaped like a dome. The cornea helps to shield the rest of the eye from germs, dust, and other harmful matter. It also helps your eye to focus. If you wear contact lenses, they float on top of your corneas.
    