EYE AXIAL LENGTH MEASURING DEVICE

PROBLEM TO BE SOLVED: To provide an eye axial length measuring device capable of precisely measuring an eye axial length even if there is alignment deviation to an examinee's eye.SOLUTION: An eye axial length measuring device includes an interference optical system which has a light source for emitting low coherent light, irradiates the cornea and fundus of the examinee's eye with at least a part of the light emitted from the light source, and receives the reflected light from the cornea and the reflected light from the fundus as interference light by a light receiving element, and also includes an arithmetic means for obtaining eye axial length data of the examinee's eye based on the output signal from the interference optical system. The measurement light axis of the interference optical system can be moved to the up, down, right and left directions in relation to the examinee's eye, can be moved to the position deviated from the cornea vortex of the examinee's eye, and is provided with a correction means which corrects the eye axial length data based on the alignment deviation amounts of the measurement light axis of the interference optical system and the cornea vortex of the examinee's eye in the up, down, right and left directions, acquired beforehand.