Patent idea elaboration - online optician and glasses sales

Last night I was reminded about the huge price difference between the
cost of glasses in canada and korea by friends at a party

But the barrier to ordering online is knowing your prescription

Sure you can got to the site and get instructions for getting your
prescription from a list opticians

Or

I can do it online - using the same idea I told about before for
watching your computer / tv without your glasses

I can give eye tests on the computer (administered by a registered
professional) and patent the software that does it and use it to sell
glasses online like an ebay / amazon