CHECKERED PLACIDO APPARATUS AND METHOD

摘要

2137151 9324049 PCTABS00028 A Multi-Functional Corneal Analysis System for ascertaining the shape of the corneal surface of the eye comprises a CCD camera, frame grabber board and digital image processing algorithm with associated processing circuitry. The CCD camera receives a reflection of a target such as Placido's disc from the surface of the cornea. The CCD image of the reflection of the Placido disc from the corneal surface is captured by the frame grabber board and subjected to digital analysis after treatment in an edge detector. The edge detector reduces the number of data points that must be processed to define the radius of each ring in the reflected Placido disc image. The resultant data are processed to derive surface contour and to provide a display in tabular, graphic or pictorial form of the contour data so generated. The system can be used to design custom contact lens.