I am almost completely blind in one eye so it is always 2D for me.
My husband is legally blind in one eye but can see shapes.
He can see modern 3D films.
He thought STID in 3D IMAX was the best 3D film he ever saw. My teenage son thought the 3D in STID was better than the 'Hobbit'.
They of course were sitting in the best seats in the the cinema while I was sitting to the left of screen.