best plan on how to open a new optical buisness?

Honestly, I'm left with a feeling that you have given up before even beginning.

"you have to be rich to start a business"; "willing to loan her 30,000$. not nearly enough to do anything with"

Will you roll up your sleeves for this to succeed, or are you more looking for an external reason to end this idea and go back to a salaried job?

First off, that $300,000 number, how did you arrive at that? Did you plan to pay all expenses associated with the first year of operation in cash before starting? Don't do that, spread out expenses over time, to so that you generate income which you can use to pay some / most of the expenses.

Second, that $300,000 number again, get massively creative and start working on reducing it. Find things you can get away with not doing, by offloading them to upstream suppliers, buying them cheaply from others, etc.

If you want to be an entrepreneur, then don't just accept the first deal you're offered as being the fair market price. Get creative, negotiate the price down, find other ways, negotiate deferred payment, find a way forward.

The book "Starting on a Shoestring" is a classic read on this topic. It doesn't tell you exactly what to do, it's more like an inspirational tale describing which kinds of supplier financing etc can be available.

One last thing, don't bet the farm. Do not take out a $300,000 loan secured in your house and your other belongings. If it doesn't work out with the business, you'll be in a very dark place. Find a way ahead that is less costly in terms of up-front capital needs.

http://www.handsonbanking.org a resource that may be of some help walks through all the basic types of financing and what to think through. Specific for a business http://www.handsonbanking.org/htdocs/en/s/

You may want to put a business plan together if you haven't already. Get an idea of how many customers will come over to the new location, how regular they are and what that means in sales. Since your earnings are fairly well known I'd think that a program in the http://www.sba.gov/ may help. The usual suspects for first round of funding is self, friends and family.

Luck

Will her suppliers take payments on the equipment? I'd start shopping around for loans/plans from suppliers and look for used equipment to start - also perhaps take on a partner.

EDIT

Oh - nevermind Jesper already mentioned this point.