There is provided a technique for adaptively acquiring, from a tomogram of an eye region, diagnosis information data of the eye region which is used for the diagnosis of a plurality of kinds of diseases, without increasing load on a user. When a power value calculated on the basis of a current detection value by the current detector and the voltage of the commercial power system is less than the output power of the inverter, the output of the inverter is suppressed, thereby suppressing reverse power flow to the commercial power system. The main shaft is formed at the end with threads for enabling the adjustment nut to press tightly against the respective components on the main shaft. In order to solve the glare, the size of unit patterns which make up an entire pattern and do not cause glare was defined by use of the value of the average length RSm of the roughness curve element of the embossed surface.