It depends! If you are a trying to sign a lease in a desperate need area for the company they'll be more hands off in your decisions. In my opinion, they'll want you signed up for every vision insurance that is available. The lease contracts will always be structured in the companies best interest. If you want this language in the contract you can specifically request it but don't count on it. Most contracts will say that a 3rd party (i.e. Cosco) cannot interfere with the licensed doctor's professional judgement. The leases will be structured that says either party can terminate the contract within 30-60 days. So if you don't play by their rules they will find a reason to replace you eventually. Consider after a year, a new graduate is desperate for a job and tells Costco that he or she will accept VSP in network.