Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) Costeff syndrome ?
    ### Response:
    Costeff syndrome is a condition characterized by vision loss, movement problems, and intellectual disability. People with Costeff syndrome have degeneration (atrophy) of the optic nerves, which carry information from the eyes to the brain. This optic nerve atrophy often begins in infancy or early childhood and results in vision loss that worsens over time.
    