it's hard to believe we have 170 degree vision (seeing as we look straight ahead). so I tried it. I stood up, with my arms stretched out and back slightly (i.

it's hard to believe we have 170 degree vision (seeing as we look straight ahead). so I tried it. I stood up, with my arms stretched out and back slightly (i.e. open 200 degrees) looking at a point straight ahead. I wiggled my fingers but couldn't see them. Keeping my arms outstretched, I then continued looking ahead at the point and wiggling my right hand and moving my right arm forward slowly (without bending my elbow) until I noticed the wiggling. Then still looking at the same point ahead I repeated with my left arm, again without bending my left elbow. After both were in my peripheral vision I checked to see where my arms were. Sure enough, my arms were nearly stretched out 180 degrees! They were only forward ever so slightly off of straight horizontal. It's insane that we have that kind of peripheral vision. Try it!