| 摘要 |
PROBLEM TO BE SOLVED: To precisely determine the corneal abscission quantity for providing a desirable correction result by calculating the corneal abscission quantity data on the basis of the corneal curvature distribution before operation and the distribution data of objective ophthalmic refractivity in a refraction correcting operation for correcting ametropia by removing the corneal surface. SOLUTION: Prior to a refraction correcting operation, a mode changeover switch 40 is switched, the image of a subject eye taken by a CCD camera 38 is image processed by a corneal form arithmetic part 53 to perform the edge detection of a ring image that passes through P. da Consta's disc. Each edge position to the corneal center is provided every prescribed angle step to determined the corneal curvature. The objective ophthalmic refractivity is calculated form the output of light receiving parts 15a-15h by an ophthalmic refractivity arithmetic part 52. Thereafter, a keyboard 58 is operated according to the instruction displayed on a color display 56 on the basis of both the data, the corneal curvature is converted to the corneal surface refractivity by an analysis part 54, and the analysis program for satisfying the relation with the objective ophthalmic refractivity is executed to determine the corneal abscission. |
