Macular edema: I am unclear as to what the "sac" is - are you sure he had X-rays. He might have had a test called an OTC which will detect cysts with fluid underneath the macula. Fluorescein is a dye inject in an arm vein, which will leak from abnormal vessels in the back of the eye. It is a clue to diagnosis and treatment of the retina.
Answered 3/22/2017
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