What does grossly normal macula mean red eyes?

Answer 1

Physicians use "gross" or "grossly" as descriptors meaning "absolutely", "positively", "majorly" "big time" plus whatever word follows.

So "grossly normal" means "the macula is absolutely, positively, majorly, big time" NORMAL.

The macula is part of the back of the retina, where the occular nerve enters. The macula and retina are part of the eye.

Redness of the scleras (the whites of the eye) occur usually from irritation but not from anything abnormal with eye structures.