Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) Color Blindness ?
    ### Response:
    Most of us see our world in color. We enjoy looking at a lush green lawn or a red rose in full bloom. If you have a color vision defect, you may see these colors differently than most people.     There are three main kinds of color vision defects. Red-green color vision defects are the most common.
    