| 摘要 |
When a corrective lens for diopter adjustment is attached in front of an eye under test, the focal position of an observation optical system for observing an eye and an image pickup magnification ratio undergo an unwanted change. In the present invention, the following are provided: a display element 12 for displaying a visual target for a testee; a display optical system 11 in which disposed, in the order given and on an optical axis 18 which extends from an eye position at which a testee'e eye 8 is located to the display element 12, are a first lens, a mirror 20 that has wavelength selectability, and a second lens group 21; an image pickup element 16 for picking up an image of the eye 8 of the testee which is located at the eye position; an observation optical system 15 that is disposed on an optical axis which extends from the eye position to the image pickup element; and a diopter adjustment mechanism for adjusting the diopter of the testee. The display optical system 11 and the observation optical system 15 share an optical axis 18a which extends from the eye position to the mirror 20. The second lens group 21 is disposed on an optical axis 18b which is not shared with the observation optical system 15. The diopter adjusting means adjusts diopter by causing the lenses belonging to the second lens group to move in the optical axis direction. |
