I’m nearsighted, I wear prescription lenses. I noticed today my vision seemed a little blurry in the mid-afternoon, even when i took my glasses off and cleaned them that didn’t really help – but I yawned, streched and my vision snapped back to normal. I noticed this before, years ago, before I first got my glasses that squinting and yawning were the only things that helped.
Why does yawning clear up my eyesight?