Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) X-linked congenital stationary night blindness ?
    ### Response:
    X-linked congenital stationary night blindness (XLCSNB) is a disorder of the retina. People with this condition typically experience night blindness and other vision problems, including loss of sharpness (reduced visual acuity), severe nearsightedness (myopia), nystagmus, and strabismus.
    