The first time it's shown that Steve's bionic eye can "see" time displacement as witnessed by his ability to watch the alien move across the room in a "blink of an eye".
An "alien symbols eye-chart" is seen on the wall of the aliens' examination room, a chart complete with alien-language characters of varying size, just like humans' eye-charts have. A single big symbol at the top, and then rows of progressively smaller symbols as they proceed on down the page.