I am not sure if eyemaster accept VSP. But i know that EyeMasters work with a wide variety of vision insurance companies to help people get affordable eyewear. And they carry eyeglasses, contact lenses and frames and other accessories. So, I believe Eye Masters will accept it. You can visit their sites and consult their stuff. And here is their sites: http://www.eyemasters.com/
About the question whether the eyemaster or visionwork accepts the VSP insurance as their method of payment, I am not sure. You can call their service department and ask the detail. But the Walmart allows this payment. That is why a lot of people with VSP insurance come to the Walmart to buy the eyeglasses.