Patent ID: 7677727
Filing Date: 2010-03-16
Classification: A61B

Abstract:
1. An eye refractive power measurement apparatus comprising: a measurement optical system comprising a projection optical system for projecting measurement light onto a fundus of an examinee's eye, and a photo-receiving optical system having a two-dimensional image-pickup element, for photo-receiving the measurement light reflected from the fundus on the image-pickup element as one of a ring fundus reflection image and a substantially-ring fundus reflection image which is formed by a plurality of spot fundus reflection images; a light deflection member which is placed in the projection optical system and the photo-receiving optical system and is positioned aside from a position conjugate with a pupil of the eye; a rotation unit arranged to rotate the light deflection member about a measurement optical axis of the measurement optical system; a memory arranged to store the fundus reflection image photo-received on the image-pickup element as a measurement image; an analysis unit connected with the memory, which is arranged to perform analysis of the measurement image stored in the memory; and an output unit which is arranged to output a result of the analysis performed by the analysis unit, wherein the analysis unit detects one of the number of images and a width of an image in each of meridian directions in the measurement image, and judges that the eye has irregular astigmatism when one of a portion in which the number of the images is two and a portion in which the width of the image goes beyond a predetermined level is detected.