Vimscript: Trigger when cursor moved between lines

I need a autocmd trigger to use when the cursor moves between lines.

Now I'm using:

:autocmd CursorMoved * call MyFunc()

With it, MyFunc is executed in each cursor movement, but I need a trigger only when cursor move up or down (not right and left)

EDIT:

Checking the cursor line with the last recorded line works for me.

if line(".") != s:recordedLine
 let s:recordedLine = line(".")
 ....