The effect of systematic lens parameter variation on the fitting characteristics of RGP lenses

In the art of rigid contact lens fitting, practitioners must be able to make judgements to obtain the desired fit and to overcome wearing problems for the contact lens patient. The new rigid gas permable (RGP) lens materials offer the practitioner opportunity to optimize contact lens design for use in fitting and patient management. Successful fitting techniques using RGP lenses demand careful patient selection, understanding of design principles, and proper material selection. The use of diagnostic fitting and flourescein examination can be powerful tools in reaching a successful fit and management evaluation for your patients. This paper/video will discuss and illustrate the effects of variations in base curve, diameter, power, center thickness, and edge profile. Through use of high resolution biomicroscopy we will demonstrate how varying these parameters will clinically alter the lens-cornea fitting relationship