Amazon says it will put more than 20,000 pairs of AI smart glasses on delivery drivers by the end of 2027. The glasses switch on when the van parks. They show which package to grab, then walking directions to the door, hazards along the way & a proof-of-delivery photo - all in the driver's line of sight instead of on a phone. Amazon says 500 drivers have already used them on 275,000 deliveries & estimates they save up to 30 minutes per shift. The science question here is “attention”. A driver looking down at a phone isn't looking at the stairs, the ice, or the dog. Putting information at eye level removes that glance. But aviation researchers found the catch decades ago with pilot heads-up displays: attentional tunneling. When information floats in front of you, your eyes stay on it & your awareness of everything else narrows. The display is in your line of sight, but so is the world & the brain doesn't always split them well. So the real test isn't whether the glasses work. It's whether they make drivers safer or just faster. Amazon reports serious vehicle crashes are down more than 23% from its broader safety upgrades, but that's the company's own figure across multiple changes, not a study of the glasses. 30 minutes a shift, multiplied across millions of daily deliveries, is the business case. Whether the driver's eyes end up on the doorstep or the display is the one worth measuring. 📐