| 摘要 |
PROBLEM TO BE SOLVED: To provide an optotype presenting device capable of performing an exact optometry by presenting the image of a target always at a fixed distance to an eye to be tested without regard to an optometric space. SOLUTION: A concave lens 10 is inserted into a target optical system 6 corresponding to the change of a distance to a device body 1 from the eye to be tested E to form a target image at a fixed distance. Thus, the target image of a fixed dimension can be presented to the eye without regard to the distance between the eye E of a patient and the device main body 1 and the exact optometry with respect to the eye E is carried out without regard to the optometric space. |
