Apparatus and method for measuring the visual contrast visual acuity and dynamic

摘要

A by A method of operating a data processing apparatus for testing the visual contrast and / or sight, and displays a symbol on a display device, brightness, color, and symbols to be displayed, a contrast, to display, changing any one or combination of contrast or luminance contrast brightness of symbols displayed on the display device, color and / or color and / or, and, for displaying the symbol a method comprising changing the period.