Paul made his dad admit that he and everyone else knew that Antoine was not eligible to play at Lake Windsor but kept quiet as they won so many football games. Paul's metaphor was

Paul uses the metaphor of eyesight... being blind to something that you don't want to admit to.

"I guess it's about your eyesight, Dad. Your eyesight, and Coach Warner's, and Mr. Bridges's, and everybody else's who's 'shocked' today. Because I've seen lots of those Lake Windsor guys in lots of places. Everywhere we go, in fact. But I've never seen Antoine Thomas. I've never seen him anywhere except at the football stadium. That's because he doesn't live around here, Dad. He lives in Tangerine. Everybody knows that."

Dad looked down. He knew that I was right. He knew the truth.

The phone rang again, but he didn't answer it.