I'm not an MD. Jumping from "he blinks a lot in interviews" to "his lacrimal ducts cannot manufacture the lipid portion of tear fluid" is silly. It's like something from a TV show doctor. He's being interviewed and some people blink a lot when they're nervous!
Van Morrison is a world famous musician who has performed on stages since the 1960s. When he last visited my city about a decade ago he played for nearly the entire duration of the show with his back to the crowd as a way of minimizing the performance anxiety that he felt.
The lacrimal duct doesn't produce the tear film lipids, it's the meibomian gland. Also I think he meant the lacrimal gland, not the duct, but that'd still be incorrect.