Investigation of the Effects upon Keratometry by Second Generation Silicone Hydrogel Contact Lenses

Abstract

Aim: Detection of keratometric differences induced by daily wear of second generation silicone hydrogel (SiH) contact lens (CL) with hydraclear. Study Design: Prospective cross-sectional study. Methodology: The researchers investigated the difference between the keratometric values at equivalent spherical and cylindrical diopters of daily wearers of second generation SiH CL and those in an age-matched control group who wear only spectacles because of SiH CL’s stiffer moduli. The study also examined the effect of second generation SiH CLs on the corneal topography. Seventy asymptomatic, biomicroscopically normal eyes of SiH CL wearers and 70 eyes of non-lens wearer control subjects have been included in this study. The SiH CL wearers have been wearing lenses in the range of less than 6 months to 3 years. General Linear Models (GLM) with type III sum of squares was used (SPSS 15.0 for Windows). Results: Statistical analysis showed no significant difference between two groups regarding keratometric values (p > 0.05). Conclusion: Results suggest that daily wear of second generation SiH CL with hydraclear, which havemoderate modulus and higher oxygen permeability, does not affect the central keratometric readings.