i dun think tat is due to blind spot. yes it is true tat there
is a blind spot in e eye where there is no photoreceptors at e
spot, and nerve cells send signals from the photorecptors to the
brain...
blind spot will be automatically made up by ur eyes...each blind
spot in each eye is different. therefore wat e blind spot is
missing in e left eye will b made up by the right eye.
i wld tend to say tat u would bump into a lamp post is not due to
blind spot, but cos of attention deficit...
green spots occur as negative after images....eg, if u came across
tis famous illusion in sleepy hollow, where johnny depp was playing
w tis toy. two strings attached to a cardboard, on e cardboard, one
side its a bird, e other is a cage..as he twists e toy, e bird seem
to appear in e cage.
e image carries over to e next scene...tis has to b fast, as e
images can diappear...green spots is due too looking at purple for
too long, once e pruple colour disappear, a green colour will
appear although there is no colour there...
e purple dots will disappear due to mainly two reasons. one, ur eye
cells are fatigue, they no longer send signals to e brain (too used
to the purple colour) however, if u move ur eyes, e cells will
receive new signals, so, will still condt to see e purple
colour...the other is due to the fact tat ur attention is on the
cross..the dots will disappear..
