New approach to area image analysis of Scheimpflug photos of the anterior eye segment.

Based on the Scheimpflug principle, the rotating photo slitlamp Topcon SL 45 can produce photos of a high depth of focus from a slit beam through the anterior eye segment. The Scheimpflug photos are digitized with a special semiconductor camera. A new method, using the digital picture subtraction, is presented. This method is suited for experimental and clinical studies dealing with the development of the lens opacities.