Below is an instruction from Human. Write a response.
    ### Instruction:
    What are the genetic changes related to bradyopsia ?
    ### Response:
    Bradyopsia can be caused by mutations in the RGS9 gene or in the RGS9BP gene (which is also known as R9AP). These genes provide instructions for making proteins that are necessary for normal vision. The proteins are found in light-detecting cells in the eye called photoreceptors.
    