Patent ID: 7794087

Claim:
An optotype presenting apparatus arranged to present an optotype to an examinee's eye, the apparatus comprising: a main body which comprises: an optotype forming unit comprising a first display arranged to display an optotype and a second display arranged to display an optotype, and a beam combiner arranged to combine optical paths of the first display and the second display, the optotype forming unit arranged: in a case where light bundles of the optotypes from the first display and the second display have polarizing axes, to adjust the polarizing axes of the optotype light bundles; and in a case where light bundles of the optotypes from the first display and the second display have no polarizing axis, to provide polarizing axes to the optotype light bundles by using polarizing plates, whereby the optotype light bundles from the beam combiner form optotypes which have the polarizing axes perpendicular to each other; and a projection optical system arranged to project the optotype light bundles formed by the optotype forming unit onto an examinee's eye at a given distance for a test; an optotype selecting unit with which optotypes for a test including a first optotype for a visual acuity test and a second optotype for a binocular vision test using polarization can be selected; and a display control unit arranged to control display of the first display and display of the second display based on a selection signal from the optotype selecting unit, the display control unit arranged: in a case where the first optotype is selected, to control one of the first display and the second display to display the first optotype; and in a case where the second optotype is selected, to control one of the first display and the second display to display the second optotype for a left eye and control the other one to display the second optotype for a right eye.