Patent ID: 8016418

Claim:
An eye axial length measurement apparatus comprising: a light source which emits a low coherent light; a non-contact eye axial length measurement unit for optically measuring an axial length of a patient's eye in a non-contact manner in such a way that the low coherent light emitted from the light source is split into a measuring light and a reference light, the measuring light and the reference light being caused to interfere with each other and received by a photo-receiving element, and the eye axial length being calculated based on a difference in optical path length between the measuring light and the reference light when an interference signal is generated; an ultrasonic eye axial length measurement unit including an ultrasonic probe with a transducer, the ultrasonic eye axial length measurement unit being placed in a position with a deviation from the non-contact eye axial length measurement unit; an XYZ driving unit including a base, a head support unit attached to the base, and a movable unit which supports the non-contact eye axial length measurement unit and the ultrasonic eye axial length measurement unit movably in X-Y-Z directions with respect to the base; and determination means which determines whether a cloudy portion which is an obstacle to measurement by the non-contact eye axial length measurement unit is present, based on one of a measurement result of the non-contact eye axial length measurement unit and an imaging result of an anterior segment section imaging unit placeable in the non-contact eye axial length measurement unit.