Jim Naughtie on BBC’s Today this morning, interviewing some expert about the latest conclusions, that prescribing below strength spectacle lenses was actually damaging to the future eyesight of child wearers, got the answers “Yes”, “Yes, that’s right” and “Yes, exactly” to his first three questions and was left floundering momentarily like a fish (flounder ?) out of water at not needing to probe more deeply. A magic moment.