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Unlike Snellen acuity, which gives simple black and white images that are relatively easy to distinguish, the Functional Vision Analyzer gives us a sequence of targets to be recognized by the patient and they are at varying degrees of grayscale and cycles per second and as they progress through these different images, the patients are less and less able to recognize them unless their vision is extremely good. The Functional Vision Analyzer gives us a view of the patient's function that is much more refined than the standard testing was used to.