Ok how does this work. Does it trigger before or after the defender modify Thier attacks?

Before.

It triggers in the 'attacker modifies defence dice' step because changing a dice result is a modification.

Ok I wanted to make sure I don't know why looking at the new chart threw me off

To be sure I have juke and evade token

I attack say I end up with 3 hit.

My opponent rolls 3 evades.

At this point I can use juke to change on to an eyeball

Then the defender can further modify with any tokens ect?

Correct.