system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why do our eyes “click” in place when we look around? (ex. looking at a wall and tracing it left and right)
gpt
That's called saccadic masking. When you move your eyes to look around it's less 'real time camera' and more 'individual photos stitched together to make a panorama'. As your eyes move from point A to point B, your brain switches off image processing, making you functionally blind (for up to an hour a day IIRC). Your eyes take a picture of point A, then point B and merges them together, to create the illusion you saw the whole panorama. 

Fun fact: you can observe this temporary blindness by looking in a mirror and trying to watch your own eyes move.