It sounds like the findings need unravelling by an expert.
Everyone has a "blind spot." Try looking straight ahead and moving your finger in from an outstretched arm (in a straight line), towards your nose, and there will be a moment when your peripheral vision lets you down, (then re-appears as you move your finger towards your nose.)
I'm wondering if they've found an "enlarged" blind spot in your case? (The tests can sometimes be a little subjective.)
Without wishing to falsely raise your expectations, Drusens can be more normal than not, especially in over 40's.
Seek the help of an ophthalmologist to sort your symptoms, and please keep us informed.