Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) Duane syndrome type 1 ?
    ### Response:
    Duane syndrome type 1 is the most common type of Duane syndrome, an eye movement disorder that is present at birth. People with Duane syndrome have restricted ability to move the affected eye(s) outward toward the ear (abduction) and/or inward toward the nose (adduction).
    