| 摘要 |
An eye refractive power measuring apparatus includes a light projecting optical system, a light receiving optical system, a focusing unit, a calibration optical system, a focus control unit, and an arithmetic unit. The arithmetic unit, based on a relation of a control signal obtained when a calibration beam is projected and a calibration value that is an output of a light receiving unit, and a correlation of a calibration value obtained in advance and eye refractive power, calculates a correlation of the control signal and the eye refractive power, and, based on a control signal obtained when measuring beam is projected, a measured value that is an output of the light receiving unit, and the correlation, calculates the eye refractive power. |
| 主权项 |
1. An eye refractive power measuring apparatus comprising:
a light projecting optical system that projects a measuring beam for use in measurement of eye refractive power on a fundus of a subject's eye; a light receiving optical system that causes a light receiving unit to receive reflected light from the fundus; a focusing unit that forms an image of the reflected light on the light receiving unit by moving a focal position; a calibration optical system that projects a calibration beam for use in calibration of the focusing unit; a focus control unit that outputs to the focusing unit a control signal for controlling movement of the focal position; and an arithmetic unit that, based on a relation of the control signal obtained when the calibration beam is projected and a calibration value that is an output of the light receiving unit, and a correspondence relation of the calibration value and the eye refractive power obtained in advance, calculates a correlation of the control signal and the eye refractive power, and, based on the control signal obtained when the measuring beam is projected, a measured value that is an output of the light receiving unit, and the correlation, calculates the eye refractive power.
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