When he reads about the ego, he's going to discover a footnote explaining that although some of Jung's structural terms are drawn from the Freudian psychoanalytic lexicon of the day, the terminology is not necessarily used in the same way.
He'll want to borrow your glasses to get a better look at the citations page.
When you give him your glasses, he's going to check the prescription.
And he'll perform a taste test, just to be sure.
The results of his taste test will determine that Jung was in desperate need of an editor, that technical reading is exhausting, that the mother is his favorite archetype, and that you should definitely get your eyes checked as soon as possible.