PROBLEM TO BE SOLVED: To provide an ophthalmologic diagnostic apparatus in which a flicker does not occur in an LED even when a battery is exhausted.SOLUTION: In an ophthalmologic diagnostic apparatus which includes an LED drive part 20 for driving an LED 11, and a light control part 15 for modulating a direct-current power source voltage VB from a battery 12 into a pulse voltage VP of a predetermined wavelength T composed of a high voltage part VH and a low voltage part VL, and outputting it to the LED drive part 20, and in which the LED drive part 20 drives the LED 11 by the pulse voltage VP output from the light control part 15, an output monitoring part 16 for monitoring whether or not a voltage value of the low voltage part of the power source voltage VB that fluctuates by an influence of driving the LED 11 by the pulse voltage is not lower than a threshold voltage set to a value exceeding the minimum driving voltage value stops supplying the power source voltage VB in order to stop driving the LED 11 when it determines that the voltage value of the low voltage part of the power source voltage is lower than the threshold voltage.COPYRIGHT: (C)2015,JPO&INPIT【課題】電池が消耗してもLEDにフリッカーが生じることの無い眼科診断装置を提供する。【解決手段】LED11を駆動するLED駆動部20、電池12からの直流の電源電圧VBを高電圧部VH及び低電圧部VLからなる所定波長Tのパルス電圧VPに変調してLED駆動部20に出力する調光部15を有し、LED駆動部20は調光部15から出力されたパルス電圧VPでLED11を駆動する眼科診断装置において、パルス電圧による前記LED11の駆動の影響により変動する前記電源電圧VBの低電圧部の電圧値が最低駆動電圧値を超える値に設定された閾値電圧を下回っていないかを監視する出力監視部16が、電源電圧の低電圧部の電圧値が閾値電圧を下回ったものと判定した場合に、電源電圧VBの供給を停止してLED11の駆動を停止する出力監視部16を有する。【選択図】図2
