| 摘要 |
PROBLEM TO BE SOLVED: To provide an instrument for measuring the focal distance of an eye which is small and capable of measuring it in real time. SOLUTION: The instrument for measuring the focal distance of an eye 10 related with this embodiment is provided with an optical irradiation system 12 for irradiating an incident luminous flux I advancing in the direction of an x-axis and gradually varying in a diverging or focusing rate in the direction of a y-axis with respect to the direction of a z-axis, a cylindrical lens 14 arranged on the optical path of the luminous flux of the luminous flux I to collect the luminous flux I in the direction of the z-axis to project to the eye E, a half mirror 16 arranged on the optical path of an outgoing luminous flux O irradiated to the outside of the eye E with an image S at a retina of the flux I projected to the eye by the system 12 as a secondary light source to change the optical path of the flux O and CCD 18 arranged on the optical path of the flux O whose optical path is changed by the mirror 16 to detect the distribution of luminance in a direction corresponding to the z-direction of the outgoing luminous flux.
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