Fixed, thanks!

The professor isn't arguing a different point to his wife than he was lecturing to his students; he's just responding to her from the viewpoint of the philosophy he is teaching. Interestingly, some of what he says isn't that different from LW ideas. His problem is that he forgets that his view of reality should add up to normality. Just because people can't see things directly but must instead look at copies of things within their own brain does not make vision "mere" or mean that fixing his daughter's eyesight is somehow less important (as his wife amusingly reminds him).