All of that is incorporated in a small Bluetooth vision testing device that temporarily attaches to your smartphone. You stare into the device, which works in concert with an app on the phone, and based on where you see the intersection of a green and red line, it takes a series of measurements.
After ten measurements taken of the left eye and ten of the right eye, it spits out a series of numbers the company calls "EyeGlass Numbers." These are specifications you can send to some online eyeware suppliers, and get back a pair of vision-correcting glasses.
A second component in the $69 kit is a pair of white frames with special markings on them. These are the PDCheck frames and are designed (again, in concert with an app) to measure your pupillary distance, or how far apart your eyes are from a focal perspective.
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