Fractal Approach for Substrates Surface Topography Image Evaluation

Abstract

It is well known that bio/non-bio interface between the living tissue and the artificial object is established through its surface. The main physical attribute of these artificial objects made of biocompatible materials is surface roughness. Surface characterization, as a part of the coating characteristics, needs to be defined in order to describe the surface complexity. The roughness of coatings and substrate surface was found to demonstrate fractal properties. This is why fractal dimension is suggested as a parameter for the evaluation of contact lens surface topography images.