I just find out the answer for you from walmartcontacts.com. It accept vision insurance from the follow companies: Cole Managed Vision,Davis Vision,EyeMed,Spectera,VSP. The general procedure for reimbursement for these Insurance Providers is as follows:
Fill out an Out-Of-Network Reimbursement Form.
Include with the form an itemized receipt (Walmart provides these with every purchase).
Mail, Fax, or Email the completed form to the corresponding vision insurance provider.