On 26/04/2016 00:21, Mr Macaw wrote:

Simple experiment. A hula hoop around your head, with a coloured bead
slid slowly round it, while you stare straight ahead. You shout out the
colour when you see it.



That would be a couple of degrees then as rods don't detect colour only
cones do that and they are in the centre of your field of view.
Any colour you see in the peripheral field is just made up by your brain.