| 摘要 |
PURPOSE: An auto-focusing device and a method thereof are provided to calculate the moving direction and the moved amount of an eye examination device by comparing the eye examination average diameter when a diaphragm is not used and the diameter when the diaphragm is used. CONSTITUTION: An optical detector takes a photograph of an eye examination ring image reflected from the cornea. An iris diaphragm(30) secluding the ambient light is driven with a motor(40). A beam splitter mirror(60) is installed in the front of the iris diaphragm. The eye examination ring image transmitted from the beam splitter mirror is photographed in an optical detector(20).
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