Helen Keller's Child's Vision

Okay, listen up, Joel. You thought you were being clever but let me break it down. You think Helen Keller's kid is blind cause she uses a fork? The joke is based on the idea that Helen can't see, and by extension, that she fed the baby with a fork which is absurd, so her kid would also have trouble seeing. This is a play on the fact that if someone can't see, it means they are blind. Do you understand? It's all in your simpleton mind.