PROBLEM TO BE SOLVED: To provide an optometric system causing no dispersion in the ratio of display contrast of a visual target such as a chart based on the individual difference of a visual target display.SOLUTION: A display information storage region includes a first inherent information storage region for storing display inherent information, and a second inherent information storage region for recording contrast information of a display part 2d1 based on the individual difference of a display body 2a. A main control circuit 314 corrects a visual target image based on the read contrast information and displays the visual target image displayed on the display part 2d1, under set contrast conditions.
