A comparative study of optical quality for different polymeric contact lenses

The comparision between pure organic polymer namely Poly(methyl methacrylate) "PMMA" and impregnated with Titanium dioxide nanoparticles (TiO2 NPs) as contact lenses on image quality of human eye have been investigated. Pure PMMA and TiO2-PMMA materials were considered and applied using ZEMAX software as contact lenses (CLs) basis on Liou & Brennan eye model. Ocular performance was evaluated and analysis by three criteria, namely tangential modulation transfer function (TMTF), wavefront aberration characteristics and root mean square (RMS) of spot diagram. All the criteria showed that contact lens made of TiO2-PMMA when its refractive index (RI) = 1.61 and Abbe number (νd) = 31.8 provided the closest imaging properties to the healthy eye. From the results of our investigation, PMMA doping with TiO2 resulted in balanced RI with νd polymer and it provided the best retinal image when it used in CLs in comparison with image properties of the resulting image using the lens of pure PMMA polymer.