The human eye is different from most animals in that we have a large sclera — the white part of the eye. It’s theorized that we evolved this so we could silently communicate where we are looking.
The human eye is sensitive enough that – assuming a flat Earth and complete darkness – you could spot a candle flame flickering up to 30miles (48 km) away.
When you apply pressure directly to the eyeball it can decrease your heart rate.
You can’t sneeze with your eyes open.