Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) Pigment-dispersion syndrome ?
    ### Response:
    Pigment-dispersion syndrome is an eye disorder that occurs when pigment granules that normally adhere to the back of the iris (the colored part of the eye) flake off into the clear fluid produced by the eye (aqueous humor). These pigment granules may flow towards the drainage canals of the eye, slowly clogging them and raising the pressure within the eye (intraocular pressure or IOP).
    