The present disclosure relates generally to a system and method for determining the pupillary distance of a person, more particularly determining the person's pupillary distance by using a computerized screen. The system and method do not require the trip or expense of a doctor or store visit, and are optimized for convenience and cost effectiveness. In a general embodiment, the present disclosure provides a method for determining a pupillary distance of a person without physically measuring the pupillary distance with a device. The method includes receiving a front facial image of the person, determining a scale of the image based on an estimated canthal distance, and determining the pupillary distance of the person based, in part, on the determined scale of the image.
