Patent ID: 7452078
Filing Date: 2008-11-18
Classification: A61B

Abstract:
1. An eye refractive power measurement apparatus for measuring eye refractive power of an examinee's eye, the apparatus comprising: a measurement optical system for projecting a measurement target onto a fundus of the eye to pick up a fundus reflection image of the measurement target as a ring image by a two-dimensional image-pickup element; storing means which stores the picked-up ring image as a measurement image; display means; measurement condition judging means having a first measurement condition and a second measurement condition which is more relieved than the first measurement condition for making a judgment as to whether or not the measurement image is appropriate, which makes a judgment as to whether or not the stored measurement image satisfies the first measurement condition or the second measurement condition to be applied; an alignment state detection means which detects an alignment state of the measurement optical system with respect to the eye; an alignment state judging means which makes a judgment as to whether or not the alignment state of the measurement optical system with respect to the eye during measurement is appropriate, based on a detection result of the alignment state detection means; and a first display control means which controls the display means to display an alignment error message when the alignment state judging means judges that the alignment state during measurement is not appropriate, controls the display means to display the stored measurement image with an error message when the alignment state judging means judges that the alignment state during measurement is appropriate and the measurement condition judging means judges that the stored measurement image does not satisfy the first measurement condition in a case where the first measurement condition is applied, and controls the display means to display the stored measurement image with a measurement value when the alignment state judging means judges that the alignment state during measurement is appropriate and the measurement condition judging means judges that the stored measurement image satisfies the second measurement condition in a case where the second measurement condition is applied.