Fluid Behing the Eye

My father was told he has fluid behind his eye.  He is going to a specialist and they are doing an angegram and other tests about 4 hours.  Are you able to tell me what are they looking for?

[Forum-OD-MP]

probably some sort of edema like cystoid macular edema or central serous maculopathy or 'wet' macular degeneration.  the special testing is probably a fluorescein angiogram:

http://www.stlukeseye.com/eyeq/FluoresceinAngiogram.asp

the treatment will depend on the diagnosis...everything from nothing to oral medications to laser eye surgery...