Perfection
The Great Head.
Sorry I'm not following youybbor said:i am not giving it a force or intelligence, if you see it that way maybe that's because you think of it that way. anyway about likihood vs. easyness, let's say there are two steps in a process the first step- A - is easy to do, the 2nd step- B -is just as easy to do, now which is harder to do, step A or steps A and B
@perfection: well i'm interpreting what you said two different ways, so i'll provide a solution for each
1)whay not just have the rods and cones have a series of connecting neves that 'hangs down' further and attaches to the optic nerve/disk (not sure which one)
2) have the optic disk grow in a non-linear pattern like this:
[pre] _
/
L[/pre]
you get the point
Here's the basic point, to alter the placement of the optic nerve you'd have to simultaneously alter the location of the optic stalk and the developmental process of the eye, which is a tall order (and it may not stop there as the genes may effect other areas as well). Also you still haven't demonstrated that having not a blind spot is a singificant improvement, I have a blindspot, and yet in my 18 years of existance I have not had one problem because of it.