A Dyop™ is a uniformly rotating image whose calibrated size, motion, color, and contrast provide a precise method for measuring vision. The rotation of Dyop™ images seems to disappear when they reach their Acuity Threshold whose precise diameter serves as an indicator of acuity based upon the angular arc width and your viewing distance. As a result, Dyop™ image tests are four times as precise as static image Snellen/Landolt acuity testing, do not require literacy let alone the ability to read English, may be used regardless of language or culture, can even be used to measure acuity in children as young as five months of age, and when used with color contrast may be used to measure visual chromatic aberrations such as those associated with dyslexia-type symptoms. Calibrated Dyop™ images a