Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) Dry Eye ?
    ### Response:
    Dry eye occurs when the eye does not produce tears properly, or when the tears are of poor quality and dry up quickly. The eyes need tears for overall eye health and clear vision. Dry eye can last a short time or it can be an ongoing condition. It can include a variety of symptoms, such as discomfort and pain.
    