Back palm training can be seen at 1.48 of the following clip.
http://www.youtube.com/watch?v=yWvo5vKJLIA
As far as the finger tips strike may hurt eyes, I have no prove but was told. I just don't want to take any chance on that. May be someone else can answer this question.
手指端的末梢神經確實與視神經有關 Fingertip peripheral polyneuropathy associated with optic nerve.
You will need a teacher to help you on this. Without a teacher, your may have problem into your old age.
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