Below is an instruction from Human. Write a response.
    ### Instruction:
    What are the genetic changes related to X-linked infantile nystagmus ?
    ### Response:
    Mutations in the FRMD7 gene cause X-linked infantile nystagmus. The FRMD7 gene provides instructions for making a protein whose exact function is unknown. This protein is found mostly in areas of the brain that control eye movement and in the light-sensitive tissue at the back of the eye (retina).
    