Close vision (clear vision at 20 inches or less), distance vision (clear vision at 20 feet or more) color vision (ability to identify and distinguish colors), peripheral vision (ability to observe area that can be seen move up/down or left/right) and depth perception (three-dimensional vision, ability to judge distances). Ability to perform more complex math functions (add, subtract, multiply and divide) to include calculating percentages, averages, volume, ratio and interpreting graphs - using numbers and units of measure.