@dr_humanupgrade: Blurring your vision on command happens because of how your eye focuses light. Inside your eye, a muscle controls the shape of the lens. This muscle adjusts focus so you can see things clearly at different distances. Some people can consciously relax or adjust this focusing muscle, which causes the lens to shift slightly and makes their vision appear blurry. Others find it difficult because this focusing process is mostly automatic and controlled by the nervous system without conscious control. So it’s not about the eyes changing, it’s about how much control your brain has over the focusing mechanism. Follow @dr.humanupgrade for daily upgrades to your biology, lifespan, and healthspan.

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