Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) Gillespie syndrome ?
    ### Response:
    Gillespie syndrome is a disorder that involves eye abnormalities, problems with balance and coordinating movements (ataxia), and mild to moderate intellectual disability.  Gillespie syndrome is characterized by aniridia, which is the absence of the colored part of the eye (the iris).
    