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I tried to describe to the patients exactly what this machine is doing and I tell them “Do you remember the old style television tuners that had VHS you just click, click, click?” and that is Snellen acuity. UHF is a fine tuning, so we can measure the places between the settings much more accurately and with greater reproducibility, so think of being able to mag up your view of their visual function with this device so that you can accurately quantitate where they sit. This is worthwhile because patients are notoriously incapable of describing the quality of their vision, so this device allows us not only to put a number on it but a graphic that is useful in documentation.