| 摘要 |
<P>PROBLEM TO BE SOLVED: To perform an alignment of an ophthalmologic device accurately and quickly. <P>SOLUTION: In S1, coordinates of three bright spots of a cornea reflected image are detected from an image of an anterior portion of an eye taken by a two-dimensional image pickup device. In S2, the diameter of the pupil is acquired from the three bright spots detected in S1. The process shifts to S3 wherein the diameter of the pupil which is computed in S2 is determined and the process shifts to S4 when the computed diameter of the pupil is 4mm or below or to S6 when it is beyond 4mm. In S4, a position of the center of gravity of the pupil is calculated and the center of the pupil is acquired. In S5, an eccentricity amount of the alignment in the XY direction between the center of the pupil and a measuring beam axis is computed, then the process shifts to S7. In S7, the eccentricity amount of the alignment in the Z direction is acquired by the eccentricity of the X coordinates of the upper and lower bright spots in the cornea reflected image detected in S1. In S8, the eccentricity amount in each X, Y and Z direction is determined to be within a prescribed range or not, and when it is beyond the prescribed range, the process shifts to S9 wherein the eccentricity amount is decreased by driving a motor according to the eccentricity amount, then the process shifts back to S1. <P>COPYRIGHT: (C)2004,JPO&NCIPI |
