Yeah I was the one that posted this. BUT, I got drilled a lot on why I never shadowed, and partly because I ran into problems with OD's not allowing students to shadow. I never understood the reason, but I explained this in interviews. If you can't get a shadowing position, make a concerted effort to research the profession a lot (i.e. Modes of practice, scope of practice, ethics, location, a little bit of history wouldn't hurt, you'll always get the question: Define Optometry in your own words, or what is an optometrist).
Best of luck.
Ryan