You may wish to consider having a fluorescin angiogram done. It's similar to the way an opthalmologist checks the back of your eyes, but more thorough and complete.
It serves two principal purposes:
(1) It's more detailed than the standard test, and
(2) Since the test involves actually taking a picture of your retina which is then kept on file, it supplies a benchmark to compare against, to help track whether you are getting worse, staying the same, or improving.