(Project), even if you want to switch the brightness of the target with the background, the reference range allowed by the visual inspection There is no departing, suitably may be inspected, but also, even when a plurality of devices for adjusting substantially the same luminance, and provides the index indicating device that the adjustment is easy.(solving means ) index indicating device for displaying visual inspection target with a,display to be illuminated by the backlight-it (display) has a light amount changing means for changing the amount of light of the backlight, - a has, to the structure . is characterized by havingbackground luminance selecting means - select the background intensity is selected from the plurality of background luminance of the target with a predetermined phase, in the background brightness of each step is variable range by the light amount changing means thereby changing the amount of light corresponding to the reference data - and,background brightness based on the amount of light to change the data selection means of correction for correcting means-it (correction means), background luminance measured by its roughness ~~ (measured that background brightness) is a background luminance of when the predetermined change the amount of light by the light quantity changing means operating ~~ and data input means for inputting, the background luminance input by the input means and the predetermined amount of light to change data Compare to have an operation means for obtaining the compensation light intensity change data - has thetarget with background luminance, vision test, backlight, display(과제) 시표의 배경 휘도를 전환하고자 하는 경우에도, 시력 검사에서 허용되는 기준 범위에서 벗어나는 일이 없고, 적절하게 검사를 할 수 있으며, 또한, 복수의 장치를 대략 동일한 휘도로 조정하는 경우에도, 그 조정이 용이한 시표 제시 장치를 제공한다.(해결 수단) 시력 검사 시표를 표시하는 시표 제시 장치는,백라이트에 의해 조명되는 디스플레이 - 그것 (디스플레이) 은, 백라이트의 광량을 변경하는 광량 변경 수단을 갖는다 - 를 갖고, 하기 구성을 갖는 것을 특징으로 한다.배경 휘도 선택 수단 - 배경 휘도의 선택은 시표의 배경 휘도를 미리 정해진 복수 단계에서 선택되고, 각 단계의 배경 휘도는 광량 변경 수단에 의한 가변 범위
