Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) Cerulean cataract ?
    ### Response:
    Cerulean cataracts are opaque areas that develop in the lens of the eye that often have a bluish or whitish color. They may be present at birth or develop in very early childhood, but may not be diagnosed until adulthood. They are usually bilateral and progressive.
    