Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) X-linked juvenile retinoschisis ?
    ### Response:
    X-linked juvenile retinoschisis is a condition characterized by impaired vision that begins in childhood and occurs almost exclusively in males. This disorder affects the retina, which is a specialized light-sensitive tissue that lines the back of the eye. Damage to the retina impairs the sharpness of vision (visual acuity) in both eyes.
    