Topography and Phase Images Investigation of the Used RGP Contact Lens Inner Surface

Abstract

Growing interest in biomaterials manufacturing and surface technology has prompted in an investigation of contact lens (CL) surface based on fractal approach, using JSPM 5200 instrument for measurement and MatLab software for image processing. Topography and phase images were recorded in order to investigate surface roughness and properties after an extended period of CL wearing. Since there is no strong recommendation for RGP CL wear period, wearer's reports on the end-stages when they notice that vision is deteriorated, vary considerably. The authors` aim is to point out that time is merely a commercial category for RGP CL replacement and that only significant changes in surface properties render such replacement necessary.