Take the 2-minute tour ×  Our eyes are spherical, our retina is
circular, but still our eyes can see more in the horizontal
direction than in vertical direction. Why is it so, why is the
preferred aspect ratio not square?  share|improve this question
This is just a hypothesis: but there is probably not one
"preferred" aspect ratio, even for one individual. It probably
has to do with the following points: 1. the eyes are positioned
on a horizontal line; 2. the width between the irises; 3. how
far you are looking. And let's not call it a "preferred" aspect
ratio. It's more like an "effective" aspect ratio. My hypothesis
is that the closer you look, the wider the effective aspect
ratio is, and the further you look, the more circular it is. And
if you cover one of your eyes, you'll probably get a circular
FoV regardless of distance. –  Kal Nov 5 '12 at 9:28 I have to
agree with Kal, but mainly about #1. Essentially, the eyes are
next to each other, and this allows for stereoscopic vision. If
you cover one eye, yo