On Mon, 25 Apr 2016 22:54:09 +0100, Harry Bloomfield wrote:

michael adams a écrit :
Meanwhile, back in the real world...

"The visual field of the human eye spans approximately 120 degrees of
arc.
However, most of that arc is peripheral vision. "

https://en.wikipedia.org/wiki/Vision_span

My own test on myself, suggests mine is much wider than that close to
200 degrees. Raise a finger of each hand concentrate on the PC screen,
move the hands back at either side of the head, until the fingers
disappear from view - 200 degrees.

I'd say that was about right. (mine is about 140 degrees of course)