| 摘要 |
<P>PROBLEM TO BE SOLVED: To solve the following problem only a projected ring shape pattern is separated, since patterns by reflection/refraction/scattering with an intraocular lens are superimposed in addition to the original ring shape pattern projected on an eyeground, when an eyeball with the intraocular lens mounted thereon is observed by projecting the ring shape pattern, and then, the patterns by the reflection, etc., are not required for the original measurement, whose existence is an obstacle image. <P>SOLUTION: A measurement optical system includes a configuration having a focus in the neighborhood of the eyeground. When the system is moved forward and backward by several milli-meters with respect to an optical axial direction in the neighborhood of a focus position near the eyeground, the focus state of the image is hardly changed. Since the intraocular lens is located between a cornea and the eyeground, the patterns by the refraction/reflection/scattering with the intraocular lens are changed concerning the shape/position/magnification in response to the position of the intraocular lens. Then, deformation and movement are performed. Thus, a measured image is processed by addition/storage in a slight movement state, so that an original reflection pattern from the eyeground is separated by determining the level of an added luminance numerical value of the measurement pattern. <P>COPYRIGHT: (C)2004,JPO |
