1. A vision tester comprising: means for displaying a plurality of visual indicators or a special visual indicator on a curved display screen whose center of curvature substantially coincides with the visual axis of a subject to be tested, means for moving an image of a displayed visual indicator in a predetermined direction on the curved display screen, means for detecting a speed of movement of a visual indicator image on the curved display screen when the subject responds to the moving visual indicator image, and means for determining a subject's dynamic visual acuity based on the detected moving speed.