Since everyone's vision is unique to their individual needs, every member must have their own Sightbox account. If you want to pay for multiple accounts on one credit card, you can "add a family member" from within your account.
To add a family member, sign into your account at www.sightbox.com. The landing page when you sign into your account should be the "My Plan" page, which includes information about your prescription and payment schedule. At the bottom of this page is a large orange button that says "ADD A FAMILY MEMBER". Click this button to proceed to the signup process and register your additional family member.
We currently do not offer a discount for multiple family members who sign up together, but any family member added using this method will automatically receive our $20/$20 rewards plan benefits. This means that the original account holder will receive a $20 credit on their next bill cycle, and the new family member will receive a $20 credit on their second bill.
If a family member wants to sign up but wants to have their own payment method, simply have them sign up through your referral link (more on how to find that here).