I did this yesterday, worked great!
They are offering a free exam in most states. YMMV if your state is eligible. It's for a basic exam for contacts that you can do at home on a computer with a webcam. Prob would work on an iPad also.
It's meant to be a basic exam, took me 5 mins to do, and just for renewal. You should NOT do this if you have eye issues or feel like you need a real exam.
BUT the best part is, you get an actual PDF of your prescription that you can download and take somewhere else to buy contacts with and a more resonanable price vs 1800 contacts.
AND if you need contacts, I have VSP through my work, I've ALWAYS found it cheaper to order through walgreens use whatever 25% or 30% coupon code is available and then submit an out-of-network claim through VSP.