Patent ID: 6409344
Filing Date: 2002-06-25
Classification: A61B

Abstract:
An ocular refractive-power measuring device for measuring the refractive power of an eye to be examined, comprising:a refractive power measuring unit projecting pattern light rays for refractive power measurement onto a fundus of the eye to be examined, receiving the reflected light of the pattern light rays from the fundus by a light receiving element and measuring the refractive power of the eye to be examined on the basis of a shape of the pattern light rays projected onto said light receiving element; an alignment detecting unit projecting light rays for alignment detection toward the eye to be examined and detecting a state of alignment between a vertex of a cornea of the eye to be examined and a device body on the basis of corneal reflecting light of the light rays for alignment detection; an alignment unit aligning said device body on the basis of an output of said alignment detecting unit; a storage unit storing the shape of the pattern light rays received by said light receiving element; and an eclipse detecting unit detecting the presence of an eclipse in the pattern light rays due to a pupil of the eye to be examined on the basis of the shape of the pattern light rays stored in said storage unit, and a direction of the eclipse, wherein, when said eclipse detecting unit determines that the eclipse is present, said alignment unit moves a position of said device body on the basis of a result of detection by said eclipse detecting unit such as to adjust an alignment between the pupil of the eye to be examined and said device body.