Can multiple users use the same EyeQue Account for the PDCheck?

Yes, with the PDCheck you can measure the pupillary distance of as many people as you would like.  If you are using your EyeQue account and save the PD results, those results will be saved to your account.  If the person you are measuring would like to save their results, they will need to have an EyeQue account of their own.