You've heard this a million times. . .but do you actually do it? Read your manuscript aloud. Don't feel smug if you write novels -- it's just as important for you as it is for picture book writers.
Someone else out there can explain the brain research behind it, but your ear catches things your eye forgives.
Your eye is like your favorite grandma, saying "That's just fine, honey. Good job."
Your ears are TSA agents prepared to stop anything questionable from getting past. Those unintentional echoes, awkward phrasings and snippets of stiff dialogue that your eye scans and okays don't stand a chance against your ears' fine-tuned aural scanners.