Patent ID: 9055894
Filing Date: 2015-06-16
Classification: A61B

Abstract:
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.