I went through a post (Can you tell me about the correct usage of "over here" and "right here"?) and I guess I understand the explanation on it
"right here/there" sits inside "over here/there"
A tutorial (00:02:23) seems to use the expression to convey another meaning
... the cornea over here ...
The area pointed out by the red circle is very close to the exact area of the cornea, which is along the blue one.
I guess the green one demonstrates inside while the blue one means next to. Is my understanding right? Could someone please give a hint? Thanks in advance.