Below is an instruction from Human. Write a response.
    ### Instruction:
    How to diagnose Multifocal choroiditis ?
    ### Response:
    How is multifocal choroiditis diagnosed? Multifocal choroiditis (MFC) is diagnosed by an ophthalmologist, using a series of imaging techniques. A test called flourescein angiography uses a special dye and camera to study blood flow in the back layers of the eye.
    