Patent ID: 7862175

Claim:
An optometer for subjectively examining refractive power of an examinee's eye, comprising: a main unit, including a pair of lens chamber units, which selectively disposes an optical element in front of the examinee's eye; a controller having a base unit, a supporting part extending upward from the base unit, a switch panel provided on the base unit for transmitting a signal to the main unit, and a control part; a display unit on a front surface of which a display screen is provided, the display unit being supported by the supporting part in such a manner as to be rotatable about a horizontally extending axis by a hinge mechanism located in approximately a center of a rear side of the display unit, so that orientation of the display screen is changeable between a first side with the switch panel and a second side without the switch panel by the rotation of the display unit and a top and a bottom of the display screen facing to the first side and a top and a bottom of the display screen facing to the second side are reversed; and a sensor unit for detecting at least one of whether the orientation of the display screen is in the first side and whether the orientation of the display screen is in the second side; wherein the control part controls a display of the display screen based on a detection result of the sensor unit to allow a display image on the display screen oriented to face to the second side to appear in the same direction as a display image on the display screen oriented to face to the first side even when the top and the bottom of the display screen facing to the first side and the top and the bottom of the display screen facing to the second side are reversed.