BASIC CONCEPTS

Computerized Videokeratoscopes


With the advances in computer 
technology and video cameras, 
computerized videokeratoscopes were 
developed.  Most, but not all, of the 
present corneal topography instruments 
still use a modified Placido’s disc as 
the target.  The concentric pattern of 
rings is then captured by a CCD TV 
camera and digitized by an image 
processing board in a computer.  Once 
the image is digitized mathematical 
computations can be performed to 
determine the corneal shape.